[GrimZata]

This one is a tough one, actually, I love both shows, but going simply on biast, Blade would win(With Kenzaki being my favorite Kamen Rider character, period.) But, by the end of their respective series they're both quite powerful, and could go head to head with a lot of the other Main Riders, and come out victorious. I could actually see Kenzaki having trouble fighting with another Rider, under any circumstances, he'd rather sacrifice himself rather than defeating the other person, unless they were a bad guy(Not taking the Decade version in to account, of course.) But, in terms of power alone, Blade would probably win.