Yea, Colossus. Though this is a great match-up, because both of them gain exponential strength. The stronger they are in their human forms, the much more stronger they are in their transformed states.
In this situation, Colossus is MUCH more durable. And like someone else said, She-Hulk can't seem to take too much of what dishes out. Colossus can take hit after hit after hit after hit and keep getting back up, not dazed at all. And don't forget the over 100 Ton lifting capability of Colossus.