Originally posted by cdtmHard to say exactly how much more powerful Gotenks was, but we DO know he was more powerful than Goku by a significant margin, using Super Boo as a measuring stick.
Equal? News to me, never thought SSJ Gotenks was quite that strong. His fight with Buu was mostly with techniques, physically he couldn't do much of anything until SSJ3.
Upon seeing/sensing Super Boo, Goku(who can very accurately sense ki) outright stated that he was stronger than himself and Vegeta, and knew they'd have NO chance against him without fusion:
https://i.imgur.com/y4irR7p.jpg
This tells us Super Boo >> SSJ3 Goku + SSJ2 Vegeta.
Flip side, SSJ3 Gotenks was no less than equal to Super Boo -- in fact, it's possible that Gotenks had slightly more raw power if you look at their fight in the manga. He just couldn't perma-kill Boo, is all(which required even greater levels of haxx/plot-armor than he was capable of generating.)