Even if LSSJ Broly and SSJ3 Goku are 4-B, Goku as a SSJ3 is 4-B to a larger extent then Broly, even if LSSJ Broly is a bit above Super Perfect Cell, I have SSJ2 Goku above both Cell and Cell Games SSJ2 Goku by a decent margin, we know that Majin Vegeta stated that Goku was at least stronger then Gohan was against Cell after becoming an SSJ2, so SSJ2 Gohan (Cell Games)>=Super Perfect Cell>SSJ Goku (Buu Arc), so if I say that SSJ Goku in the Buu Arc is like 90% of Cell (which still gives Cell a noticeable advantage against Buu Arc SSJ Goku) since SSJ2 is 2x SSJ, then Buu Arc SSJ2 Goku would be 1.8x both SSJ2 Teen Gohan and SPC which is a big enough boost to stomp, seeing as how Namek Saga Vegeta 2 shotted Cui with roughly a 1.33x difference, then we have Buu Saga Vegeta, the reason Vegeta allowed Babidi to control him was because Goku was still noticeably stronger then him, Vegeta also trained for the 7 Years time skip hard like Goku, so Buu Arc Vegeta should also be above Cell Games Gohan by at least a bit, maybe 1.1x or 1.2x stronger, point is, M10 LSSJ Broly MIGHT be around Buu Arc SSJ2 Vegeta, but not Buu Arc SSJ2 Goku, then SSJ3 is a 4x boost from SSJ2, therefore I still see SSJ3 Goku wrecking LSSJ Broly, the only way I see Broly standing up to Buu Arc Goku is if he was LSSJ3 like in the Raging Blast games, Heroes, Dragon Battlers etc, then again, Broly would be the one stomping Goku seeing as how Heroes says LSSJ3 Broly>Buuhan/Super Buu (Mystic Gohan Absorbed) lol