Vegetto is still poised to win this fight.
These two would be more or less deadlocked with each other until Gotenks either defuses inside of Buu or Vegetto decides to ascend to SSJ2. I actually believe Buuhantenks or whatever you want to call him would be strong enough to bridge the gap that exists between himself and SSJ Vegetto. I have no doubt that he was in a different league than Buuhan, but if you look closely at a number of Vegetto's facial expressions as he was physically retaliating against Buu, it does seem like he had to exert some effort.
SSJ Vegetto from the manga wasn't giving Buuhan the opportunity to land a blow on him then deride him for the futility of the effort as, say, Piccolo Daimao did with Goku in their first battle.