Ok...this is a good thread...first off, I would jus like to say a lot of people have said some really good points...as most everyone who is familiar with me knows, Thing is my fav character...wolverine is about #4 these days. But now, Im going to make my argument for Thing.
-someone said Wolverine has fought more powerful characters...then went on to mention Juggernaut.
-Thing is a member of the Fantastic Four...to um...go to the more powerful opponent argument one has to be on crack...
-with the FF Thing has fought Terminus, Galactus, Celestials, Abraxis, The Beyonder, and countless others...the only notable power the X-men have faced is Dark Phoenix...
On his own, Wolvie has fought Hulk...Wendigo..hmm not many other real powerful types, and no cosmic types.
without the FF, Thing has fought: Hulk, Jugs, Thing(from other times/dimensions/clones), Champion of the Universe(one of the Elders of the universe), Sasquatch, Terrax, Occulus(Surpasses the Silver Surfer in power), The Beyonder(yes they have fought one on one), Doctor Doom, The Destroyer, Namor, Thanos, Thor, Blastaar, Wrecker, Rhino, Ronin ther Accusor, Klaw, Wonder Man, The Obliterator, Black Bolt, and well you get the point...he lost some of those fights, but considering all those guys are more powerful than him in every way, it shows Thing will take on anyone. Thing afraid of Wolverine? Wolverine is afraid of Thing, they had an encounter after wolvie scarred him remember?
from looking at their previous encounters, Wolvie's superior fighting abilities are not a deciding factor, Thing has always been able to connect with relative ease...when wolverine attacked invisible woman, Thing grabbed his little ass and slammed him into the floor...not many guys can do this with Wolvie IMO...Then after getting slashed, Thing knocked Wolvie through a building...In FF vs X-men, Thing knocked Logan out with one casual blow, showing he would be very vulnerable to a full blown punch by Thing....Wolverine may get some slashes in but they wont go right through his skin like the Hulk's...only Wolverine's most ferocious attack is gonna cut Thing...but then he's gonna get KO'd real fast.
Concerning Thing's healing, his anatomy and healing is not like a normal human's...when Wolverine slashed him he said "I can feel myself oozing out beneath this helmet...meaning he does bleed but his blood isnt like a humans...although it hurt him, he didnt let it stop him for the fight with a Watcher powered Doctor Doom...He also bled in his fight against the Champion of the universe...I have also seen a mind controlled Invisible Woman shove invisible daggers into Things body...although he went down for a moment, he got back to hius feet and used a thunderclap to knock sense back into IW and extinguish the Human Torch's flame.