We are all familiar with World Breaker Hulk. He is the strongest Hulk because he is the Hulk that uses both Bruce's genius intelligence and Hulk's brute strength & rage. Now, in the Ultimate Wolverine vs. Hulk arc, we saw Bruce control Hulk so is this kinda similar to the World Breaker persona of his 616- counterpart or is this a different situation?

Kinda the same, in the Ultimate U, Bruce was able to gain full control over his Hulk form, although I believe he still has to be in a stressful or life threatening situation to transform. But even then, Ultimate Hulk has been defeated easily by foes much weaker than him and can be taken down easily as well (Ex: Wasp was able to knock him out by zapping him in a certain part of his brain), so that does make World Breaker superior in a way.

The difference is that WB Hulk is a trained gladiator too who learned to control the hulk through battle, pain, and heartache where as Ult Hulk was tamed though concentration and mediation. WB Hulk is pure rage plus intellect while Ult Hulk was just a calm smarter Hulk

slowly being forgotten marvels plan for a good universe, screw it up so bad nobody reads it and then throw it out

Ultimate Hulk gained control in Ultimate Wolverine vs Hulk, but read his other stories, he lost control and continued to be savage.