My first was Silver, then I got a bunch more (that are in my closet somewhere, and I can't remember which specific versions because I have so many). I actually haven't played my Gameboy any recently (because I've been playing KH for the thousandth time), but my favorite, I think, would be Silver, simply because that's what got me started. I haven't even bought Pearl or Diamond though, and I don't really plan on it.