i personality think he would get stomped by ssj1 vegito since we dont even know how powerful he is. if not ssj then ssj2-3 with ease lol
let sum this up
super vegito>base vegito>Buuhan>Gotenks buu>Piccolo buu>Super Buu>Kid buu>evil buu>ssj3 goku>fat buu
beerus chopping ssj3 goku isnt enough to prove that vegito wouldnt been able to done the same.
btw beerus does have a limit since even being a godly ki being, he is not immortal like buu, he was hurt by ssj2 enraged vegeta with no godly ki.
Vegito also fought opponents who had Unlimited Power, Transmutation, Absorbing Others,could Regenerate from nothing, and turn people into piece of candy regardless if they are stronger than him.
superman wins against
ssj god goku (unless he defeats supes before the timelimit)
beerus (with solar system busting feat at best)
superman looses too
Vegito ssj (power limit unknown yet, toyed and stomped immortal beings with ease )
Omega shenron (took entire energy of universe to defeat him, has many techniques and tricks up his sleeve, dragon ball fusion gave him 10x power boost.
ssj4 gogeta (MFTL capability, beyond universal level)
whis (twice as strong as beerus, who defeated ssj god goku which was much stronger than ssj4 goku, he could most likely solo omega shenron no problem)
also i think ssj3 goku after battle of gods stomps too since his base mode alone is much stronger than ssj3 from buu saga