Doc-Ock is a beast, though Green Goblin is a close second. I have a 4* 3/30 Doc-Ock that I'm just waiting on tech advancement to take to 4/40, and unduped he's still a beast. I really don't care for Vulture much.
Vulture is the best have him as a 3*, I wish I had him as a 4/5* (speaking from a point of how cool he looks and some of his abilities like draining power or making next attack miss and incinerate upon evading an attack).
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lol then it's definitely Doc ock(if you're talking in game).
Opinions vary but Oc seems to be better unduped. He has a decent power lock and damage. His power drain once awakened can be problematic.
Infinite heal block or power lock if you play him right.