This is very dependent on the scenario in which these two fictional characters find themselves. Basically, the fictional Godzilla is superior to a T. rex, even if he were twice as big (atomic breath). But if the T. rex can attack Godzilla before the latter can react at all, then T. rex could also win, if he were double the size of Godzilla.

I hope I was able to help you with your imagination struggle, and I'm happy to answer any further questions.
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