tbh, there aren't really much city / town that I like in DPPt - not that the revamp of Pt is bad or anything, there aren't ANY major areas that are that great (barring Veilstone City; which I hate the music there >.>). So I reside in Battle Frontier about 90% of time. (the other 10% is for Day-care center, and that's about it?)
in RSE, I always stay at Mauville City, since I like the city tune, great places around, great day-care center area, and basically in the centre of other cities.