as far as modern relevence goes, probably the original. I haven't seen or heard of a tournament for it in years, Tourneys are about the only way older entries stay relevant. I think alot of people are misinterpreting the question as "which game will leave behind the smallest legacy". Which is fine since that's a fun thing to talk about too. I'd say wii-u/3ds will have the smallest legacy. a small install base (comparatively) and terrible single player will always leave this one lacking to me.