The lot sizes are generally bigger in the established areas, I believe.
An advantage to the new-build areas is that EVERYBODY is new to that section. Thus all are coming in on "common ground". But I don't see the existing neighborhoods to have a real big downside in that respect. Yes, everyone there might have lived there for a while..........but we have yet to meet anyone in TV who isn't welcoming to newcomers (except for that one guy in his car who glared at us while we were going the wrong way around a building in a golf cart - - - but I digress
). We're in the midst of buying a 3 year old resale and met a few of the neighbors while we were looking at the place and driving around the neighborhood. You might have to go up and knock on a few doors now and then to meet some folks, but I don't view that as being a show-stopper to meeting someone. Go to them if they don't come to you!
Bill