Life or death, which heavyweight would you choose?

You are Thanos snapped into an empy arena, boxing ring in the center. Thanos informs you that you'll need to select a champion, and that champion will have to fight a 5 random heavyweights, all one month apart. If he wins all 5, you live. If he loses any, you're going to be tortured and killed.

Which heavyweight do you pick as your champion?