Can't decide on Mesmer or Necromancer, please help

Most of what a necro can do can easily be accomplished on a hero.

Mesmer is the way to go.

Mesmer. It´s very much better nowadays. Necro is outrunned by heros most of the times

For a person who said they don't want to mindlessly cast spells your best bet would be mesmer. Skill description will tell you what research you have to use for an area you are in. Ex: if the area has more melee foes then caster foes the skills description will tell you what areas they'd be useable in. As a mesmer you'll do a lot of interrupting so you have to know what your skills are what area they are good to use and when touse them, you'll have to watch the foe and time it just right to accomplish the skills ability. So go mesmer. Another option is if you have two slots make one of each and try both and see which you like best.

Ok thanks much for the info guys. I guess I'll go with the Mesmer then.

Quick question though, and it goes a little off topic; what would be the difference between the Necromancer and Elementalist? If they are both (so called) mindless casters, then what is the difference? Now, I know obviously a Minion Master would be extremely different, but for the other builds.

in my opinion a necro is more support whereas an ele isn't. necro's support with mark of pain, blood bond, blood rit, bipper, defile enchantments, defile flesh, even Spiteful Spirit is a support cause the foes need a target and well a team makes great targets, there are more skills too. They have better energy regen abilities. ele's are in a sense hard and fast hitters.

Both classes more than capable of tackling all the pve content, and have good range of builds.
Both are pretty good when run as a hero, I think the idea that heroes run Necros better comes from Minion master and Minion Bombing builds which run very well on Heroes.
They are only two styles of Necro Builds and since they are a little predictable I do hand them over to my heroes to run.

Since we are talking pve here its worth noting that now we have access to 7 heroes a custom designed party makes almost any character class work.
My character is now more a general that anything else and I am there to select where and when to fight call targets and quickly finish off weakened targets.

I do take note of how my character looks so never run a male necro and never let my male mesmer dance.

I don't think necro are mindless casters. They can either spawn minions, help energy managements or even heal if they have a rit secondary. But like someone already said, all these can be done by heroes.

I think mesmer would be a better idea for you. You have lots more fun getting through the game with a mesmer than with any of the professions if you like to think through the game.

But that said, mesmers can be a frustrating class to play at times. And imo they die the fastest too when it comes to casters class when get attacked. But that would just be my opinion based on what I see with my heroes and with people I have played with

Ok, and I would just like to clear one more thing up. Elementalists are mindless casters, are they? In PvE at least, and compared to the Mesmer.

Mesmer is the least mindless class in PvE. If there was a better candidate, I'd play it instead.

Even a simple Mistrust is less mindless than any direct damage spell. That alone because 99% of whatever other professions have.
Interrupts are by definition not mindless.

Just because average mesmer today mindlessly spams Panic does not mean that class is mindelss, but that people either often prefer the easiest (but still effective) way, or they simply don't know any better.