I play in Appaloosa Plains about 90% of the time. It reminds me of a quaint, small town in Oregon, maybe Montana or even Virginia with a gorgeous permanent Fall aesthetic (which also happens to be my favorite season). I really like the houses in the town and there's a lot of space to add new lots as well; I love raising families there and it's a great town if you like Horses since there's a lot of space, a lot of houses come with barns, etc.
I also really like Sunset Valley and Riverview. SV, most likely for the nostalgia that comes with it but also because I love the huge park, the houses, the townies...it's overall a good town. Riverview because of how widespread it is, similar to AP, there's a lot of places to put lots.