I have tons of mixed feelings about each game that I don't think I can properly rank them from best to worst.. but I'll try my best.
New Leaf- Of course this game is just totally out of the others' leagues. It adds so many new features and things to do. For me, personally, it just doesn't feel as much like Animal Crossing. Maybe it's because I know of more people that play it and how popular it is (when I was little I always thought of Animal Crossing as something only me and a few others know about lol), or because it just seems so different from the others; idk but it feels so different to me. Don't get me wrong, I love it to death. I mean, it's Animal Crossing, I love it no matter what! I just don't have that same feeling about it that I had with the others. I'm not too fond of the music, but I do like the unlockables. It keeps you playing for a long time. I also love the clothes and the way you can customize your character. Socks and shoes
I'm not too sure about Main Street.. it feels sort of random to me and out of place. I LOVE re-tail. This is the first Animal Crossing game I've played that I'm actually really putting effort into: the museum, my house, villager pictures, etc. I legitimately sometimes stay up until 6am when the day restarts so I can catch my fossils and do other daily tasks. I think this game is just going to keep growing and growing on me and I can see myself playing it for a LONG time. In conclusion, I definitely think the atmosphere of this game is pretty different but change isn't always a bad thing. THis game is going to keep growing on me and it definitely has me addicted already. Sorry that was so ramble-y xD
Animal Crossing - This is the game I've played the least of, but I just love the atmosphere, soundtrack, and simplicity. This series is always about atmosphere for me, and the original is just spot on with what the series intends. Everything is slower, quaint, and so relaxing. I'm not sure that's something that can be replicated. It also had some very unique features like the aerobics, sports day, soccer balls, and islanders. I really wish ACNL had islanders like that.
City Folk - Despite everyone's hatred for this game, I was young and I enjoyed playing it and that's what matters to me. I loved the graphics, still do, and the soundtracks and holidays and atmosphere. I just really enjoyed this game even though I wasn't able to play it as much (being a console game). I loved how the maps had the cliffs, too. I enjoyed the City but felt like something was missing from it. Overall I didn't have any expectations for this game so that's why I liked it.
Wild World - This is definitely the game I spent the most time on. It was my first Animal Crossing game and I loved it so much. I used wi-fi all the time and used Action Replay and it really was more of a "game" for me as opposed to actually living with the town and day to day aspect of it. I restarted a bunch of times and just was pretty reckless with this game but I spent hours and hours playing lol
I cheated to get all of my bells and just ended up working for giveaways on forums but hey, I still enjoyed it. In retrospect, the graphics were pretty terrible (but you get used to them when you're playing I suppose), the town was too big for being a portable game (IMO) and the entire game was pretty much just empty. Not a lot of events, nothing really going on and nothing to do. If I didn't use wifi I don't know what I would've done with myself hahah the game was just so empty.