Each place is a little different. PCR will be a bigger community in my opinion and probably very family friendly. It's a different kind of community than you see in most places. You want to be friendly and neighborly and do activities in the park with your neighbors this is probably the place to be. To get a taste and feel for it, you might want to visit Lantana by the same developer on a day where there are activities. Frisco is probably going to have a younger feel to it. Frisco to me is the new Plano.
Plano is pretty much built out.....so most of the homes are more mature city. There are still plenty of kids in Plano and often what your neighborhood is like is what you make of if.
Some of the things you might consider is where your friends are, how far you have to drive to work, where are your weekend activities, etc. Only you can decide if the extra 100K is worth it, if you are just down to those to communities.
Either way you want to involve a realtor. This doesn't cost you more and often can save you a lot of time and headaches too. The sales rep works for the builder, so you want someone in your corner protecting your interests. It's fun to look but when you get serious about buying, take us with you, especially before you even say much to the builder's rep. They'll ask you lots of questions and you don't want to give them too much information.