deathstroke is Slade dude.... as far as readily known characters its a tie between sinsister and deadpool cuz they can and have come back from molecules. DPs biggest healing claim to fame are coming back from a few molecules left over in snail droppings, and being reduced to a puddle and swallowed up then vomitted up by cable.
sinisters biggest cause for healing usually comes at the hand of cyclops. once he got blasted into a million pieces on a beach by cyke and his his stuff splashed all over the place, including the sand, the jungle area and the ocean it took weeks to put himself ...including his cosutume in tact(thats hot) he also blasted into another million pieces and you saw all the nones in his body break apart, and they thought he was officially dead but he came back
1) Deadpool, Sinister, Hulk (though their healing is almost ridiculous imo...even for comic characters!!!)
2) Wolverine, X23, Sabretooth
3) Cyber, Archangel, Icarus
4) Beast, Wolfsbane, Wildchild, Marrow
THE CORPS IS MOTHER
THE CORPS IS FATHER
Wasnt Creed only better when Wolverine had adamantium and Creed didnt.
It was stated in the comics that the adamantium was treated by wolverine immune system as a foreign body so his healing factor was constantly fighting against it, effectively halving its efficiency at dealing with actual wounds and so on. When Logan had his adamantium removed his healing factor improved significantly.The Xavier Protocols speculated that at that level of efficiency it was possible for Wolverine to regenerate from a few cells.
So i really dont think Creeds is better. Lets just put them on the same level