I believe firmly that a bloodlusted Thor, a Thor that is pissed and goes for the kill can throw Mjolnir in a way that would smash through something as durable as Hulk's flesh (as he has in the past and as Hulk has been urt by much less), thus decapitating him. then again you aint gonna see this in a comic book, so....
^^Way to go at misinterpreting an out of context scan but I know you know this, don't let that stop your hate for a fictional character 👆
Anyway,
if you could use Thor's powers CBR-style he would be my choice because he would never have to lay a hand on the Banner in a featureless environment. Its his character that hinders him in this sense and against the Hulk who is stronger, more durable, faster imo, more ferocious/ruthless, and only amps from there - it will ultimately prove to be his downfall. Hulk takes this fight for me.
Thor can probably take some wins if he goes for broke from the gate but Hulk's stock just seems to keep rising.