FireRed is my favorited, but I started on GB and Charmander is my favorite, plus it has more exclusives. In the end, they're both the same game. They're identical, with the exception of a few game-exclusive pokemon that you'd have to trade for if you wanted to complete the pokedex. Check this raichu card worth here: https://howyoumatter.com/how-much-is-a-raichu-pokemon-card-worth/