Hello SonOfCapiz my friend!

I found that two handed weapons were the strongest, my first character has what I believe to be the most powerful weapon in the game and it's two handed. Even after other playthroughs I never found a weapon as powerful, as you probably know, loot is randomly generated in Divinity II, so I don't know if I will ever find a weapon like it again. Sadly, what with Divinity II saves not working on TDKS for 360, I can't remember the specific damage it caused. I think it was more than 300. I think it only gets raised by 4% because it's stronger than one handed weapons to begin with.
And as you know - I love two handed weapons anyway, even if they weren't as powerful, I'd recommend using them still in Divinity II, in my opinion - they have better animations for them than for one handed weapons. Same goes for games like Two World, Dragon Age and Mount and Blade. I always think animations for two handed weapons in those games had more work on than the other weapons in those games.