I'd be in for Vampire: The Requiem. The nWoD ruleset works really well on roll20. For those who don't know what I mean. Vampire the Masquerade is the original version of the game set in the Old World of Darkness. It was updated and replaced around 2003 (about when DnD 3.5 came out) with the New World of Darkness setting, which has a much simpler and more fluid rule set as well as consistency between the different modules such as Vampire, Werewolf, Mage, etc.