Eh? How is this even a question... Kensei has a Bankai, is a former Captain and can Hollowify. The only reason Shuhei was doing well against Tousen, was because he was angry and hurt at the man's betrayal. Kensei is a different story. Hisagi won't win against him.

My two favourite character, but now I choose here Kensei! Sorry Shuu! *-*;

I agree with blackpanther666 on some things....
But, this isn't a question on who would win, it is who you prefer.....
I choose Shuhei because even though I have almost finished the series for the third time and I still haven't seen Kensei.....so I love Shuhei!

^ I must have misinterpreted the question, or wasn't paying attention. I don't really like Kensei that much - he's okay, but I really like Shuuhei as a character.

Other than the guy's a Vizard I got nothing.