Composite Godzilla isn’t fair to Composite Goku at all. It can literally be argued to be nigh omnipionent or hyperversal because of Rozan’s feats:
Resatured an entire diemensional plain just by opening its eyes:
It can move 500 million lightyears/sec or you can say it as 15,778,799,999,031,328 speed of light to escape from nebula’s plain:
It can mentally connect with Psychics minds, take over them, and connect to minds millions of light years away
Those feats alone are too much for Goku, or anyone in DBZ to counter. Alongside the fact that Rozan toyed around with times, reality, and freaking ficitonal physics of the universe so it would look “prettier:”
I dont see anything Goku or DBZ could do here. At best, Composite Goku is only multiversal and fights only multiversal threats. Huge mismatch in favor of Godzilla. This fight really deserves this: