At this point, considering all the different inputs from authors, TOEI, magazines etc., to me the following fighters:
SSB Vegetto (BA, pre ToP)
Beerus
MUI Goku (ToP)
LSSJ Broly
LB Jiren
are all in the same ballpark in power.
Someone is a little bit stronger than the other, but more or less here they stand.
My global order of ballparks is this one right now:
1) Grand Priest
2) Angels
3) SSB Gogeta (current, post ToP)
4)
SSB Vegetto (manga, BA pre ToP)
Beerus
Strongest Gods of destruction
MUI Goku (ToP)
LSSJ Broly
LB Jiren
(^ casual order here)
5)
Jiren (serious)
UI Omen Goku
Ssj Broly
Ssj2 Kefla
Merged Zamasu (mutated, anime)
"Weakest" Gods of destruction
SSBE Vegeta (current, post ToP)
SSBKKX20 Goku (current, post ToP)
GoD Toppo
(^ again, casual order)
6)
Merged Zamasu
SSB Goku (current, post ToP)
SSB Vegeta (current, post ToP)
7)
SSBKKX20 Goku (BA, pre ToP)
SSBKKX10 Goku (BA, pre ToP)
SSBKK Goku (BA, pre ToP)
Hit (allowed killing techniques)
8)
SSB Goku (BA, pre ToP)
SSB Vegeta (BA, pre ToP)
True Golden Freeza
Hit (killing techniques not allowed)
9) Everyone else
I also believe that if MUI Goku had appeared against Broly he would have beaten him more or less in the same way Blue Gogeta is going to.
MUI is just that massive as a power boost (and, also ofc, plot reasons).
I am however glad that the form is not going to be used in this movie: MUI is something different and special and better be kept for when things are going to be really serious in future arcs.
Who knows, we could see MUI Goku again and maybe an OP MUI Vegetto/Gogeta fusion, why not...