I am about doing own OTS for fun (don't thinking about super OTS with a lot of ppl, just doing for doing), and hm... My friend likes a lot of vocations, because he is a WoW player (11 classes are there, where one has 3-4 ways to play, like tank, healer or dmg dealer). On "my OTS" I want to have 6 vocations: sorcerer, druid, hunter (paladin focused on range dmg, without holy spells), warlock (sorcerer focused on high dmg death spells and summoning undeads), warrior (knight focused on dealing dmg), paladin (knight with a lot of def stuff, holy spells, natural born blocker).
So yeah, my vote comes to Tibia original with added vocations & Tibia original with modified vocations