You're not just talking out yer ass. Yer doing it without actually explaining your reasoning, so good job on confusing TC's options there. Tool.
Anyway, TC, to observe your choices, they're both really high quality games. The difference being that LM2 has a story somewhat, it's really fun, somewhat action-orientated, and has a fair bit to do, but i'm sure there will come a point where you might need to put it down for a while. Whereas Animal Crossing is great because while it doesnt have a story beyond 'do stuff' it has an amazing life span, as the game runs in 'real time', you could play it for years (assuming you dont mess with the 3DS time) and still see new stuff turning up and things to do, etc.
Personally, I would go with AC:NL, but thats up to you mate, I suggest trying them both out if you can, or if not, go with AC:NL - I would also suggest Monster Hunter 3 Ultimate.
GamerTag: TheKiriyama Currently Playing: Defiance (UK), Battlefield 3, Borderlands 2, Dark Souls