On second thought Recoome might still take this. I'm conflicted on how weak pre Majin Vegeta was. He was confident in being stronger than a Gohan who he knew hadn't trained for 7 years, and he also said he knew the gap between he and Goku wouldn't change. If we take that literally, Vegeta might win if the Majin boost took him from his Cell Games level to Cell Games Goku's level.