I'm on the fence with this one too. Teenaged Collosus could hang in there long enough to remove his helmet. I think Hulk's durability is downplayed just to show his healing factor though.
If its a Hulk with brains that knows he just needs to remove the helmet then Cain is likely to take the 1-2 combination on his way to la-la land.
Now, we could be tricky and Cain could drop his armor altogether, effectively removing his own helmet (instead of Hulk as by the OP) at which point the Hulk is washed up and out.
Otherwise I'd give the Juggernaut the majority.