Goku would win.
Goku is leagues ahead of Broly at this point.
Goku confirms Moro was stronger than Broly
The same Moro that this happened to
Even in the Granolah Arc, Goku asks Whis was there anyone stronger than he and Vegeta and Whis says this:
He didn’t mention Broly so it’s safe to assume that Whis is confirming that current MUI Goku is stronger than Broly which is undoubtable.
Goku has honed his UI and can use it at will and even combine it with his other forms.
Broly will lose.