Honestly, the opinion that MUI Goku is > SSB Gogeta doesn't make any logical sense to me.
Even if we assume that MUI was a 10,000x amp over ToP-era SSB Goku, it still wouldn't put him even remotely close to SSB Gogeta, who was, in all likelihood, tenS of thousandS of timeS more powerful than POST-ToP SSB Goku.
...Especially when Goku could only sustain MUI for a matter of seconds in real time before he completely burned out, whereas Gogeta can sustain his power for a full 30 minutes.
srug