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Personally, I have my bets on sonic, normal Difficulty. While game sonic has far superior feats and cosmology against the entire verse, Goku is known to evolve when he faces a far stronger opponent ( jiren, granola, gas, etc ) so he would definitely push sonic to super form and give him a good fight. But either way, I still lean for sonic because he basically does the same thing at evolving against strong opponents ( infinite ), and his super form gives him at least a infinite power gap.
I personally have them at the following scale with Shadow winning
Shadow:
Low Complex Multiversal
Infinite to Immeasurable speed
Vegeta:
Low Multi - Multiversal
MFTL+
if you disagree we can debate in the r/powerscaling discord
Tournament of power arc goku