Which MMO has the best story/lore that keeps growing with each expansion/update? If TESO is your answer, which is your second best?

I actually liked the story and the overall lore of World of Warcraft a lot. My second favorite would be a game that recently folded, sadly: Vanguard: Saga of Heroes.

Although I'm not a huge WoW fan (not yet, anyway) I have loved Warcraft lore and mythos for a very long time. With what I'm reading from the WoD pre release content, I think it'll be a very fun story, considering we did all this stuff in Warcraft RTS games.