Blue was my favourite color, but I usually opted for either Charmander or Bulbasaur.
Favourite Pokemon game overall will always be Crystal, and starter being Cyndaquil (it's a hedgehog, it's made of fire, I love it by default.)
I always started out with either Squirtle or Bulbasaur, usually the former, because then I could kick ass at the first two gyms. I played Blue more than Red, which is why I put only that one in the poll.
I really didn't care for any of the first gen starters! I usually replaced them before I got to the Elite 4! If I had to pick I'd go with Bulbasaur, though. I really love all of the Johto starters, though, that was totally my favorite gen!
I went for starters:
Squritle, Feraligatr, Torchic, Chimchar, Snivy, and soon Froakie. When I played yellow, I would never actually train my Pikachu and instead used a Primeape as my starter because the in the very first gym, Pikachu has no effect on half the pokemon.