Quote from leirissa
Your 1h are gonna need dex+crit dmg+open socket. Both of each to surpass a 2h xbow.
This is only true if we look at the theoretical best weapons we can get for each slot. The reality of the situation may be much different when comparing items that are actually available. Dex on the weapons will help, but I don't think it'd be necessary in this case.
For me, I have a 2h xbow with 1027 dps and 142 crit damage. My quiver has 153 dex, 15 ias, and 8.5 crit chance. My 1h xbows have about 780 dps and exactly 178 crit each. Despite the terrible dps on the 1h'ers, they are only about 3k dps less than the 2h xbow, not very substantial when I'm already pushing 70k dps. I find the increased reaction speed to be worth more to my gameplay.
Considering R_Y_N_O's xbow and quiver, it is probably feasible to find a dual wield set up that will offer more dps. They probably wouldn't even cost a whole lot, but a 2x xbow upgrade will probably be cheaper still.