I never reset towns, or profiles on any game for that matter, until the next game in the series comes out. I will probably keep my town for a very long time unless it corrupts or I have to get a new 3DS.
Do you play a digital copy of the game then?
I have 2 copies of ACNL. I started my first game and then the second one. When I got off the 2nd train and saw that I had pears just like the 1st town... RESET. Same thing happened in WW, pears in both towns, but I didn't know then that you could just reset until you got something different. So glad I knew it this time around. As far as the map goes, I just choose the best of the 4 offered. I do not regret resetting at the beginning, but wouldn't do it after playing for a while.