I think this all depends upon what you would call decay/wear/damage. For instance, having your whole flesh ripped from your bones is painful to Hulk, but it lasts a panel at best and it has no effect whatsoever. So how would you see that as damage?
Does it look bad? ofcourse. Does it take Hulk out of the fight? not even close.
Punch a hole right through his chest and spine, it'll take a panel to repair it. It won't prevent him from launching an assault. It won't affect his capabilities at all.
Doomsday is more likely to be affected by such "injuries" than Hulk, thus WWH is the more durable, imo.