UUUUHHHMMMMM...
Methinks the WWH could win. Much like Dr. Strange said it's POSSIBLE for unrestrained Ghost Rider to beat WWH.
As for comparisons and shit. Well, Thor has stomped regular Savage Hulk before, and Savage Hulk has stomped Thor before. So it's just as easy to say that Thor CAN beat Hulk, but not always WILL. And these are fights where Thor and Hulk have something to prove, so neither were ever holding back. One fight, Thor knocks him out with a little lightning blast. Next fight, Hulk beats Thor into a crater and doesn't even know if he's still alive or not.
This fight, we're talking WWH.
We can safely say unrestrained Ghost Rider PROBABLY wins against regular Savage Hulk, but against WWH, it's only a POSSIBILITY. Frankly, as far as "physically unbeatable goes", so is Hulk. Barring simple KO, Hulk heals from anything and everything. He's even been killed before and comes right back to life on his own(except for this RULK trident fiasco). So unrestrained Ghost Rider COULD win, but not necessarily WILL. Dr. Strange's comment is especially ambiguous when you consider that it takes being unrestrained for Ghost Rider to even REACH Hulk level. Much of Ghost Rider's action is restrained by the human host, so how can we gauge what kind of fighter the actual GR spirit is, seeing as how elemental things like fire rarely bother even Regular Hulk that much. It only took a few seconds for WWH to be right at home in unrestrained GR's radiating supernatural fire dome.
This fight though, seems to be with the human hosts. If that's the case, WWH solos without breaking a sweat.