Although the Merc with a Mouth and everyone's favorite adamantium clawed X-Men have both used their near-immortal powers to return from the dead, there is a strong case to be made that Wade Wilson's healing is far preferable to that of Logan.
Deadpool's healing factor is currently science fiction, but that doesn't mean that it won't be possible in the future. Someone else mentioned in their answer that if we crossed human and lizard DNA we could achieve limb regeneration.
Like Deadpool and Wolverine – but way less publicized – the Hulk has the ability to grow entirely new tissue and heal from most wounds in just seconds. Severe wounds as well – including the near-complete destruction of his body mass – are also no match for the healing abilities of the Hulk.
By and Large, the answer is Hulk. Wolverine's healing factor is amazing, one of the best in the business. There's a reason why people are always trying to compare his against others.
Meanwhile, the Adamantium was constantly poisoning his insides; Logan's healing factor initially kept the metal's toxicity in check but, as it gradually failed, the poison began overwhelming his system and killing him. Adamantium poisoning may also have turned into the cause of his healing factor's increasing failure.
After the two heroes experience the same trivial yet costly hilarious problem, the Flash proves his healing ability is much faster than Wolverine's! For one very specific and very hilarious reason, DC Comics' the Flash proves to have a better healing factor than Marvel Comics' Wolverine.
Marvel has confirmed that Sabretooth's healing factor is stronger than Wolverine's. The two mutants have long been adversaries, their respective healing factors allowing them to survive for many years to continue their fight.
Deadpool's Face & Skin Don't Heal Because Of His Cancer
Although Wilson's powers were unlocked, and he became the suited antihero known as Deadpool, his regenerative healing factor curiously doesn't heal the scarring covering his entire body.
Because he was given a healing factor while he had cancer, Deadpool's healing doesn't just restore his normal cells but his cancer cells as well. This means that Deadpool will be stuck with cancer for all eternity. Deadpool's healing factor on the other hand has never been shown to have any limits or slow down.
While Deadpool and Wolverine are both practically immortal because of their respective healing factors, the way the two abilities work within their bodies are very different.
Adamantium plays a crucial role in the speed of Wolverine's healing as well because of the fact that it produces a poison that his immune system fights off regularly. It is said that without the adamantium, his healing rate increases.
Wolverine's healing factor doesn't have a fixed limit, working - like any power - in the way a given creative team needs it to. However, it does have rough parameters, and through non-canon moments, truly unique situations, and a few overly ambitious stories, Marvel has blurred the lines and confused fan understanding.
Of course this is the Immortal Hulk we are talking about and no other Hulks. Hulk could potentially heal faster than Deadpool due to the whole angrier he gets the faster he heals things. But they are pretty much at the same level currently.
Deadpool can survive a nuclear bomb -- how hard could it be, right? The merc has been known for being indestructible, but you would have never guessed that he could survive his very atoms being blown to bits.
But Deadpool's healing factor isn't just strong, it's also fast. He can regenerate entire limbs in a matter of minutes, and his body can quickly recover from injuries that would kill a normal person.
The adamantium does keep Wolverine's bones from breaking, but it also poisons him at the same time. If it were not for his healing factor, the admantium poisoning would kill him quickly. Without the adamantium, we heal significantly faster and age much slower.
When Wolverine's heart is torn out, a drop of his blood lands on a crystal of cosmic power, causing him to regenerate - with new powers. Wolverine is the best there is at what he does, and what he does is heal incredibly fast.
His adamantium claws are one of the few weapons in the Marvel Universe that can consistently pierce Hulk's skin and Wolverine has no problem going for Hulk's head. In fact, if it came down to it, Wolverine could cut Hulk's head off, ending the Hulk once and for all.
Hulk's inability to break Wolverine and his adamantium claws isn't an indictment of the green monster's strength but more shows how strong Wolverine's metal-coated bones really are. If the Hulk can't snap his claws, then it's unlikely many other heroes or villains could do so, either.
In that limited series (titled Ultimate Wolverine vs Hulk), the Hulk rips Wolverine in half. While epically gruesome, this scene caused some discord within the fandom, since many fans argued that Wolverine's adamantium skeleton should have prevented that from happening.
