Before this I quote the  NGA saying :

Conclusion：

1.Forever use the best DPS weapon
2.To choose the damage probability more than  105% one handed crossbow,or use bow

3.To choose the damage probability more than  105%  crossbow,or use bow
If X=the damage,150% is the foundation,y=the damage probability,z=the total damage

the original income :Z = 1-y + y*(1.5+x) = 1+0.5y+xy

   Now playing out of the weapon, two handed weapon and the crossbow bow DPS is far higher than one hand crossbows, the comparison is of the same DPS hands crossbows and GongCai more meaningful. As for a ready to ACT2 more friends, it should choose bow or crossbow? My advice is: the first to see you hit/AH buy is crossbows or bow, which DPS high which to use; Then see your body equipment, if critical strike high, then with a bow, if the attack rate/high explosive injury, with this.