I've properly scaled the GT characters before(can't remember in what thread), but a guy like Omega would literally scale to something like tenS of thousandS of times more powerful than SSJ3 Z Goku.
You'd be extremely hard-pressed to prove the SSJ3 to SSG multiplier is even remotely close to that.
But again, DBS does have the superior feats. Not arguing that.
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"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
And good; those minimal numbers still give us a very good idea on how powerful GT was in general. They're safe numbers and quite sufficient for our needs here.
Goku in GT have some good fts as well like punching the android across the planet. The thing that makes them look terrible is Goku city lifting ft as a super saiyan 4 whereas a weakened black hair Goku in DBS withstood the pressure of a black hole. I don't know why they did the Z'ers like that in GT.