I found that town kind of boring. There was nothing really to do there! I wanted to explore more around the area, but the limited travel really made me not want to go there since there was very little to see/do.
I pick Castelia/Nimbasa, btw. n_n Prettiest! Oh and Black Cityyyyy.
Also noticed you included Pokemon League/White Forest, which means since they're not really cities, you can all bring up routes if you guys want too since it all kind of fits in and if discussion leads that way do it, imo.