Wolverine. Unlike Batman, Logan's certainly willing to shove something sharp through Croc's brain, which just so happen to be his claws, which Croc just so happens to have absolutely no defense against. Logan's tough enough to take some punishment, can heal from whatever he does take, is fast enough to be able to hang with Croc and evade whatever comes his way, and just plain nasty enough to get into Waylon's face and stab him.