Nashville is a very hip, cool city
But only if you're going out and about
if you plan on sitting in a room staring at a monitor, then it doesn't matter WHERE you go.
But Nashville has a lot of fun shit, and a decent amount of fairly hot chicks, culture, art, music, nightclubs, restaurants, etc
I'm not sure how much fun Nashua is, but I've been to New Hampshire… it's very pretty