From asiasoft forum:
The claw's weapon attack is lower but that doesnt mean that the
damage they do is lower. A level 80 sin with a 51 WA claw can
easily outdamage a level 80 bowman with a 90 WA bow. This is simply
because the damage calculation for the bowman and the sin is very
different.
Try using the damage calculator. After you get your godly level 90
weapon, the only way you increase your weapon attack is by upping
your stats. For every increase in stats for the sin, they get a
higher damage increase. As level increase, sins will outdamage
archers more and more.
