Charmander.
Yeah, I started with Charmander. Ever since I first played Red, I've made it a tradition to always pick the fire-type starters for every single one of my first play-throughs. I've played FR/LG using the other starters, but to be honest, I've never beaten the Elite Four using any of the other options. Just... never happened. Don't get me wrong, I like the other Kanto starters a lot, I just have my favorites. :>