1) New Leaf: Definitely the best one by far. The ability to take on the roll as the mayor and make tweaks and additions to the town has definitely made this game stand out much more than the past ones. The multiplayer features in this one are also much better, Definitely the best one so far
2) Animal Crossing: It had a lot of its own features that weren't kept in the games following it that were really fun i.e. the soccer ball, junk yard, and just the atmosphere of it was different.
3) Wild World: Wild World was great because it was Animal Crossing, but handheld... I wasted a lot of hours on it when I was bored lol
4) City Folk: Ill be honest City Folk was a big let down... I traded it in like a month after getting it.