Kanto: Probably Koga, always like him and was happy when he got promoted to Uber Leet 4 member in Gen II. Would have been Lt Surge (Because of the animé), but he loses points for having that bin puzzle. Much annoyance.
Johto: I prefer the Gen II leaders to the first gen ones. Falkner, Buggsy, Morty, Pryce, I like them all. If I had to pick a fave it'd probably be Morty.