Now, they are both equally good. I see some situations one will be better than others.
For instance:
if you are facing mistics oponents, Red Hulk is better and will cause more damage than green Hulk;
if you are in a quest and are using health potions, than green Hulk would be better, because the lower his life is, more damage he causes, and with low health maybe Red Hulk would not have time to build his heat charges.
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For instance: