@@kusalee9769 sounds like fanfic, I think hell is more damming than being an orphan, they're both orphans but only one got to be Mundus' slave for almost two decades.
Thing is, vergil is very extremist, he immediately thought that his mother abandoned him, so if he switched places with dante, dante wouldn't have thought the same, so we would have not a good vs evil, but rather a good justice seeking avenger and a traumatised dude who still wanted to do good
Alright memes aside, if it did happen Dante would be more like a merc and Vergil would be a scholar. Vergil would understand human emotions and love and dante wouldn't care at all about humans.