NY is a big place. Some places are nicer and better than others. I live in Brooklyn and like it very much but I think its a bit too crowded there are just too many people here. There’s no denying that as far as Jewish infrastructure NY has anything you can imagine for a Jew who is from any part of the spectrum. Chassid Ger and Litvak can all find their place. Out of town there are far less options and everyone knows everyone. If you aren’t happy OOT its not as simple as just changing shuls and meeting different types of people!
Now as far as bringing up children, I still think NY has the most options as far as Yeshivos and all that and makes it much easier to find the right niche for your kids.
In my mind, the only Maaleh of OOT is that things are more spread out and certain locations have better climate. As far as Yiddishkiet goes, NY is the place to be.