LEt's see...
Wolverine: Regeneration, Adamantium skeleton & claws, and the toughest SOB in the history of the Comic Book Multiverse.
Superman: Super-Strength, Super-Speed, Enhanced Hearing, Heat Vision, X-Ray Vision, Flight, virtually Invincible, only known weakness is Kyptonite, and is stripped of powers by exposure to Red light, IE: Red Sun.
Wolverine, because he's never surrender, and if he got some kryptonite, and maybe tip his claws with it, he could take down Superman like nothing. Otherwise, superman could just knock Wolverine out in one punch....