Channing reportedly picked Amanda. According to Socialite Life, "Tatum said it was impossible to not smile and be at ease while on set with Amanda."
Maybe he just didn't want to play favorites?
Anyway, we all know his real favorite co-star would be from Magic Mike. We’re thinking Matthew McConaughey — or maybe Joe Manganiello, since Channing did say even straight men should check out the True Blood star’s body in Magic Mike. "That man is a specimen." Agreed.