I'm going through the same thing myself right now. I will share what I've found out through my own investigations.
First off with 1 handed weapons, your DPS is just about the same across the board, axes, swords, daggers, doesn't matter. However if you make a lot of critical hits, you might want something that swings faster. The same goes for 2 handed swords and axes, there's no big advantage in DPS that one type has over the other.
The only thing I'm still having a rough time working out, and that's mainly because I haven't done a direct comparision between them; are dual 1H weapons vs 1 2H weapon. With 2 1H weapons you get a little more flexibility in which traits you want to boost, however the 2H weapons tend to have slightly higher boosts.
I know that's not all the info you want, but hopefully it will help.
And if you can't decide easily, just go with what looks cool.