Tobi is really strong, of course despite of that silly attitude, he IS MADARA!!! He is one of the strongest Uchihas in the clan of course he can beat Sai!!

i think tobi would win coz hes madara uchiha and plus hes like immortal or something though i do love sai better and why is this a spoiler?

sai's cool but not so strong

TOBI !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!­!!! I LOVE THIS QUESTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!­!!!­!!!­!!!­!!!­!!!­!
GO TOBI , GO TOBI , GO TOBI , GO TOBI !!!!!!!!!!!!!!!!!!!!

if sai and tobi fight,it's sure that Tobi will win!

SAI!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!SA­I IS COOL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!GO SAI,GO SAI,GO SAI,GO SAI,GO SAI!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

tobi is way better than sai even though i like sai but tobi is way better!!!!

WTF...

TOBI A GOOD BOY!!!! sai cant beat tobi hands down. he cant even defeat one akatsuki member one-on-one but he might want to f*ck one of the akatsuki.

Tobi shall defeat him with his good boy powers!!!!!!!!!!!

animefanatic12 oh i hope not X. x

I rly dont know

Sadly Tobi would win

well... I like sai but he can't be compared with uchiha

People that picked tobi are scandolous

sorry sai but tobi would beat the shit out of him

took kakashi head on!!!!yes its tobi