As far as I've seen its more about preference now and what build you have, either higher armor or higher energy. And it seems that no one wants to really come out and say this is the best set. The only time that you can really get a response (at least its the only time I get one) is when a proclamation about something being good or better is made, then the vultures come in and pick it apart.
So here goes my proclamation, made fully knowing that some Forge Runner or Furnace Stoker is going to come in and tell me how wrong I am (of course he better tell me why as well >_<). And of course if they don't, that means I am 100% correct and none challenge my vast superior uber knowledge!!! :P
*Throws down gauntlet*
Ok. Now this is for a set of armor that is supposed to be flexible. AKA the armor set you want to get when buying an expensive one where you know that you aren't going to be able to buy another for awhile, or it's of a skin that you want to be able to use the most.
Now most "uber" warriors will want to be able to change their entire skill set depending on what it is they wish to accomplish. Thus the armor combination must take this into consideration. If you are a veteran player you most likely do this as well. If you aren't, you may find that you only use one skill set that you fill most comfortable with and think that you won't ever change it (or at least anytime soon). This is ok if you know that you are going to be sticking to your guns, but if you are buying a very expensive armor type you may indeed still wish to go with the flexible option just in case you do stumble upon something else you like better or gain enough experience that you wish to switch back and forth between builds.
So here are the various warrior armor types (PvE) and their basic uses not including helms (which should be swapped out with whatever you need at the time):
Berserker’s: + Health
Dreadnought’s: Part of the normal armor bonus against physical damage only, covers all damage.
Gladiator’s: + Energy
Knight’s: + Physical Absorption
Legionnaire’s: + Armor while in a stance
Sentinel’s: + Best Armor bonus if you maintain a high strength
http://www.gw.gamewikis.org/wiki/Warrior_armor
Now from what I have seen on here, (which could be wrong as I haven't been here long, we'll let the vultures decide afterwards

Legionnaire’s: Legionnaire’s: Not flexible enough as it requires you to be in a stance to gain the benefits. This would require that any build you switch to be stance heavy, which probably won't be the case. But nice if you always use a stance heavy build.
Sentinel’s: Not flexible enough as it requires you to constantly have 13 strength to gain the benefits. Usually warriors will wish to have a maxed weapon attribute and high Tactics. If you always have 13 strength though, this is very good armor.
Knight’s: Very flexible as the bonus is always there regardless of your build. With the latest update each piece of Knight’s Armor gives a max of -3 physical damage to the area that it is protecting. Some people say that the -3 per attack adds up; some say that its not worth it, especially as it only preotects from physical.
Berserker’s: Very flexible as the bonus is always there regardless of your build. However, most say that the health benefits aren't really worth much. Total additional health for a full set of Berserks = +35 Health. (Added benefit: You can play the air guitar (/guitar) and sing: My love for you is like a truck Berserker!! Would you like some making...)
Dreadnought’s: Very flexible as the bonus is always there regardless of your build. This is a favorite among people for the fact that it gives you extra armor against non-physical damage, which is usually what takes a warrior down.
Gladiator’s: Very flexible as the bonus is always there regardless of your build. This is the most favorite armor by the vast majority as there are many great warrior skills that use energy and warriors have very little to start with. However, if you aren't a build switcher and you use mostly adrenaline, this may not benefit you much.
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The following are percentages of how often each part of the body gets hit:
Chest - 37.5% for weapon attacks
Legs - 25% for weapon attacks
Head/Hands/Feet - 12.5% each for weapon attacks
The chest and legs are the main concern for armor as the hands and feet rarely get hit, so the minimum armor bonus is sufficient to deal with damage to those areas, as such if someone is getting a full suit it will usually be a full suit of Gladiator’s for maximum energy which is +7.
The following is my take on armor mixes for the hands and feet:
Legionnaire’s: Pointless to have on hands and feet as they don't get hit enough to warrant the additional armor that will only be present in a stance anyway.
Sentinel’s: Pointless to have as a mix on hands and feet as they don't get hit enough to warrant the additional armor that will only be present when you have 13 strength anyway. Only use if you are going full Sentinel’s.
Knight’s: Pointless to have on hands and feet as they don't get hit enough to warrant the damage absorption.
Dreadnought’s: Pointless to have on hands and feet as they don't get hit enough to warrant the additional armor.
Berserker’s: Only gives you +10 Health. Most think this is pointless as well. However, if you find yourself in a lot of situations where you would have just lived had you survived that one last blow, this could be what you want. This is more beneficial for PvE than PvP as in PvP you will probably be the last person standing if you are under full attack and 10 HP isn't going to save you.
Gladiator’s: Only gives you +2 Energy. Though this may seem like little, depending on the skill chain, it may allow a warrior to use an extra skill that they would have had to wait for their energy to recharge on otherwise. Also this is two less energy that you have to wait on to recharge before using another skill, which could mean life or death in combat time.
Stoneskin Gauntlets: Increases knockdown time on foes by 1 sec (max 3 secs). Very good unless you don't use knockdown, but if you are a skill set switcher you will.
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The first opinions mostly apply to chest and legs, the second was for hands and feet. So for chest and legs the most viable armor selections for a very flexible all around armor build are: Berserker’s, Knight’s, Dreadnought’s, and Gladiator’s. For chest and legs the most viable are: Berserker’s, Gladiator’s, and Stoneskin (See opinion on Stoneskin combo at end of post).
Most people think that Berserker’s and Knight’s are pointless to use now. If you think differently, then the following would be the best sets to use in order of worst set to best set (according to my take on popular opinion):
Berserker’s:
1) Berserker’s Chest and Legs
Berserker’s Hands and Feet
Total bonus = +35 Health
2) Berserker’s Chest and Legs
Gladiator’s Hands and Feet
Total bonus = +25 Health; +2 Energy
Knight’s:
1) Knight’s Chest and Legs
Berserker’s Hands and Feet
Total bonus = -3 damage on Chest and Legs; +10 Health
2) Knight’s Chest and Legs
Gladiator’s Hands and Feet
Total bonus = -3 damage on Chest and Legs; +2 Energy
Dreadnought’s and Gladiator’s are the most popular choices so here are the most popular possible armor combinations from least favorite combo to most favorite combo (based on my take of popular opinion

Dreadnought’s:
1) Dreadnought’s Chest and Legs
Berserker’s Hands and Feet
Total bonus = Half of the Armor Level that normally only covers physical damage (+20) will cover all damage; +10 Health
2) Dreadnought’s Chest and Legs
Gladiator’s Hands and Feet
Total bonus = Half of the Armor Level that normally only covers physical damage (+20) will cover all damage; +2 Energy
Gladiator’s:
1) Gladiator’s Chest and Legs
Berserker’s Hands and Feet
Total bonus = +5 Energy; +10 Health
2) Gladiator’s Chest and Legs
Gladiator’s Hands and Feet
Total bonus = +7 Energy
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Ok that is the best armor combinations shown in groups in order for people to see exactly what benefits they get from each groupings of specific armor sets so they can form their own opinions of what they like best. Based on those sets, the following are the top 3 most popular (flexible all purpose) warrior armor combinations. #1 being the most favorite (as far as I've seen):
1) Dreadnought's Chest and Legs with Gladiator Hands and Feet
2) Full Gladiator's Armor
3) Knight’s Chest and Legs with Gladiator Hands and Feet
Note: From what I have seen Full Gladiator's is the favorite for PVP. So for PVP switch around one and two.
Some will also wish to tweak these a bit by mixing chest and legs as well giving you:
1) Dreads chest with Glads legs, hands, and feet
2) Knights chest with Glads legs, hands, and feet
And possibly for those who really need that one point of energy for something specific:
3) Dreads legs with Glads chest, hands, and feet
4) Knights legs with Glads chest, hands, and feet
As far as the Stoneskin Gauntlets go, I think these are a must as well. Thus I would recommend purchasing one of the top three sets as well as a pair of Stoneskin Gauntlets. That way you can swap out your gauntlets whenever you are using a knockdown build.
As for Helms, you should choose the one you like best for the build that you use the most, and then work on purchasing others to swap out as needed.
Sentinel's: This armor will give you the best protection against elemental damage (as well as everything else), which is the type that most warriors have problems with. If you can fit 13 strength into most of your builds, then you should definitely consider getting this armor. If so, this can replace Dreadnought's armor in the above combinations. You may also consider going full Sentinel's as it will ensure that you fill your roll as a tank to the fullest.
Well there you go. I will be happy to edit this post as needed once its been thoroughly picked to pieces. There might be a chance that most will agree, but I'm not holding my breath.
Livingston
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