how fast are one handed weapons compared to 2 handed weapons like %10 %20? if its much faster it would benefit my character but if its not that fast than 2h would be the choice for me for aoe damage
I don't know if there's a hard number available yet, but from my eyeball-estimate, it looks like you attack close to 50% faster with dual wield (spam-clicking) as you do with a two-hander. But one-handed can also be combined with shields.
Ultimately, if you want more AoE abilities, then you want to use a two-handed weapon. Dual-wield is for quick, nasty damage that is mainly single target. One-hand and shield is for damage mitigation and general tanking.
I don't know if 1H is faster than 2H... I think it should but I have no proof of it.
You should consider also that 2Wield are 2 weapon and you have many advantages in having 2 weapons (being them 2 wield or 1H+Shield):
1) You can enchant both of them (let's say ATK SPEED?)
2) You can reach 2/3 of bonus sets!
Auto attack of 2H is slower than 2Wield or at least it seems to me
I choose 2Wield because of the 2 point listed above