Well I started pretty late with tabletop games, cause I never had the pocket money as a kid to build an army (the old bretonnian men at arms were so characterful and cool), so I was left with collecting random GW WHF miniatures at birthdays and christmas. So I started painting quite early but never really cared for the game as I knew Id never have an army.
My gaming "career"

started with Lord of the Rings after seeing the movies and reading the book. But I never really liked the idea of buying a rulebook with no idea whats in it and so I found the specalist games and found Warmaster. Tried it with a friend with cardboard cutouts and I was hooked when I saw the bretonnian men at arms which basically look the same like the old ones but in 10mm scale.
My friend took the other road and started Epic, which explains my guardsmen.

Also I would say, with a unique sequence of play (for GW) and the many different strategies/options, Epic makes it as the best GW game for me.
(Not counting BB and SH as they are boardgames like Stomm said)