I have 2 towns, one cartridge and one on my SD card. Fun, fun.
SD CARD:
1st Town
Reset 2 weeks after I started playing, because it was getting boring in the town. This was before I discovered TBT.
2nd Town
Starting visiting the online island more and more, and kept this one a while. This was the town I discovered TBT on

Reset after about a month.
3rd Town - Current
Dawnstar is amazing, though I have considered resetting. I won't do it, as I have a few popular villagers that'd likely be stolen or lost somewhere along the move, but I still kinda think about it. I've had this town a long time, though I've TT'ed a lot.
Cartridge:
1st Town
Originally bought this as a cycling town. NOPE. Found Lucky after a bit of resetting for some good starters and decided to keep the town for a while. Eventually, I think I gave him away or something.
2nd Town
Attempted to cycle again. Got attached, again.
3rd Town
The same as the first two... ;u;
4th Town - Current
Planning on resetting this in the next 48 hours; the only reason I haven't yet is I have a Stitches in the town that'll likely be raffled if I don't receive a message from the owner within the next few hours.