But consider 2 players of equil playing ability, set up their skills to fight each other.
Who would win.
Pro's and Con's
Sure the warrior has more armor.
But the necro has more energy and faster energy regen!
The Warrior has strength for armor penetration.
Necro has soul reaping, not so hot in pvp (not useless, just not omfgthisownz)
Hrm, any takers ?

I think perhaps a necro, only because their energy is more and regens faster, and through the course of battle, life leech and insta heal skills would prove more beneficial than a few % of armor pen.
But thats just my idea, what is yours and why?
EDIT: i have a 17 n/w with a big 2hander hammer.