Mystic Gohan was much stronger. SSJ3 Goku was relatively even with Fat Buu, however most likely slightly more powerful. Mystic Gohan was stronger than Super Buu who was stronger than Fat Buu.
ssj Gotenks was thought to be strong enough to deal with Fat Buu making SSJ Gotenks, and SSJ3 Goku more than likely also in the same ballpark of power. So Gotenks is at least 4x stronger than ssj3 Goku, and then Mystic Gohan is somewhere between .5 to 1.5s stronger than Gotenks.
__________________ If you try something stupid, and it works it ain't stupid.
The only thing that kind of muddies the waters in terms of where SS3 Goku stands(in the manga) is the fact that he couldn't even reach full power in his SS3 form.
So it's virtually impossible to say where a theoretical FPSS3 Goku would have ranked in comparison to Ultimate Gohan. I would *assume* the comparisons Goku made in reference to him not standing a chance against Super Boo, for example, would have factored in his full power... But again, I don't know for sure.
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Last edited by Galan007 on Sep 13th, 2020 at 06:28 PM
Vegeta got beat up for a minute, for Goku to power up his full power, only to revert back to base because he ran out of energy. So he can't use his full power in ssj3 while alive.
Course it does make one wonder, did he ever use full power ssj3 against Future Trunks or Beerus? Because he does talk to Caulifla about how terrible the form is despite the power output it has.
__________________ If you try something stupid, and it works it ain't stupid.
Against Beerus? Perhaps... if we want to believe that he mastered the SSJ3 transformation or at least got significantly better with it than during Buu Saga. Which, theoretically, should be possible. Considering how both he and Vegeta seemed to have surpassed the likes of Mystic Gohan, Gotenks or Mister Buu in the BoG arc.
Against FT? That's different, as he had the god ki at his disposal. Of course you could argue it got retconned.