In straight hand to hand I'd actually pick Dracula. He's caught a Colossus punch before and while that's about all his minor league Superhuman strength is good for in this fight, he only needs to survive a shot or two before he goes for the bite. Can Dracula pierce Thing's skin with a bite is a question I have.
Also are his fangs long enough to fully penetrate Thing's skin?
Even if that's the case is Ben standing still long enough to let Dracula do this.
I'm thinking that outside of mind-control and/or turning to mist form (choking the Thing from the inside......doubtful, but maybe), that there isn't too much going for Dracula in this one.