Raid Roach has the best damage of any archer set at 55 except for the even more expensive Customized Recurve set....the drawback is that the armor, h/s, dodge and especially m/s are not so good. If you don't mind using a lot of pots, it is the best set for damage (besides Customized). It is hard to play well, but yeah, very good damage. The Sewer King does less damage but is still decent, but has better h/s and m/s so you would use less pots all a matter of how you like to play.

p.s. Raid has a set bonus, and for now Sewer does not.