What I wouldn't give for a proper training dummy in this damn game.
So after looking at jim2point0's suggestion of getting a higher damage 2h weapon instead of the 1h xbow for my maurader build I did some testing.
Unfortunately I don't have a 2h xbow. I salvaged anything and everything I didn't think I'd use and I didn't expect a lower dps 2h xbow to become useful. I'll have to keep an eye out for another.
But what I do have is a 2750 dps uskang (as seen on my profile.. though the numbers aren't at all what they are in game. Guess they haven't fixed the damage mod for website) that has over 400 base damage more than the 1h nat's slayer. So I loaded up Ghom on T4 and tried a few things. I hit the stopwatch right as I hit "OK" on the cinematic skip. I dropped sentries when they were available and alternated regular attacks with CA's like I would when normally playing. I threw out my first couple runs as I got familiar with what I was doing. I also changed my passives to use archery after first couple runs too. I made sure both weapons were socketed with a royal emerald as well.
1h nat + nat's ring - 29 seconds
2h uskang + unity - 27 seconds
1h nat + unity - 26 seconds
I'm really having a tough time deciding if this is just standard deviation given all the different variables or if this is really saying that even without the nat's set bonus, just the unity ring + 1h nat is the best combo.
Unfortunately my lunch is over so further testing will have to wait till tonight. What I may try is not attacking at all myself. Just let the pets and sentries do the damage. That will be a better metric I think. It could account for the variation more than the weapons themselves. I will say just as an observation, I had a lot more hatred to play with using the 1h nat's and it's higher attack speed and would result in more CAs overall.
I wish I had a 2h xbow to test with too. The archery bonus of 50% crit damage could be a big factor. The 8% damage of bow vs 5% crit chance of 1h seemed to be a bit of a wash.
http://us.battle.net/d3/en/profile/garath-1132/hero/40752152
edit: added profile link and fixed unity name lol
edit2: Also my nat's ring kind of sucks right now. I've been trying to reroll it with CHD. Instead I have CDR on it right now. With proper CHD and the nat's set bonus, I'm kind of thinking the set will be the better combo.