I've played for about 15 years, I think? I use Space Marines, Imperial Guard, Chaos Marines and Orks. My Ork army is definitely my largest army, and it's pretty damn big, but my Space Marine army is definitely stronger. My Imps are outfitted for medium to small scale matches and my Chaos Marines are best suited for skirmishes.
Huge fan of the expanded universe, especially the novels. Jesus, I don't like to think about how much money I've just thrown at Games Workshop over the years, but it's a fucking disgusting amount.