I believe Ultimate Thor was shown to be stronger. Didn't he fight against Ultimate Hulk for a bit? I haven't seen the Ultimate movies in quite some time.
Is there significant difference between Ultimate Hulk and Avengers movie Hulk? Because Hemsworth's Thor seemed to be lasting for a while in the movie himself.
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Let's put it this way. Ultimate Hulk would have done a lot more damage to the Chitauri than Avengers Hulk did. He's scary in that movie, and when he goes berserk and turns against the Avengers, it was nearly impossible to stop him I think. He also slammed through a massive space ship in the 2nd movie I believe.
I need to watch it again to be sure though. It's been a few years.
Ultimate Thor gave Ultimate Hulk a good run for his money; this was the Hulk that took down a Chitauri (far stronger than their live action counterparts) invasion fleet, beat the piss out of the rest of the Ultimate Avengers and picked up Mjolnir due to extreme rage.
Ultimate Thor shits all over live action Thor. He's also taller.