Kisame without Samehada? As much as it pains me to say it gotta say Suigetsu he still has his sword (advantage is close range) and Kisame's water jutsu wouldn't really hurt suigetsu (Houzuki techs). Kisame would smash Suigetsu with Samehada, but alot of his power and techs derive from it so yeah thats me 2 cents
putting ksiame against someone who gets stronger and absorbs water, the more there is of it, is a horrible idea. suigetsu wins this. eventually.