Though there is no obvious answer to a question like this in "Dragon Ball Super," a series where power levels are constantly fluctuating with the demands of the story, u/Abe2Sapien backed up this reply. "Whis by far," they wrote. "His battle skills are so sharp he doesn't need to transform into MUI. He's just in a constant state of readiness. He can one-shot Beerus, which I doubt any mortal can do."
However, not everyone thought that the answer was so clear-cut. "Whis only dodged SSJ Broly, while LSSJ Broly was the one who fought Gogeta," explained u/Goldchamp101. "I also wouldn't say that Broly 'almost contended' with him. He didn't even land a single hit in the fight," they said.
All the same, another user weighed in, pointing out how you can get the answer from watching the characters' struggles or lack thereof in these key "Dragon Ball Super" fights. "SSB Gogeta still needed to be serious," wrote u/Mick009. "He was going to kill Broly if not for the wish. If the power gap was so big between them, Gogeta could have knocked him unconscious, but he couldn't," they postulated.
Though Whis still seems to have the edge here based on what most "Dragon Ball Super" fans have to say on the subject, it's certainly possible that the always-growing power levels of Goku and Vegeta could one day give the seemingly untouchable being a run for his money.
