Commute would be similar to downtown from both, but maybe a tad closer from Cedar Park.
Both school districts are very good.
Preschools. Both towns have a lot and different varieties.
Both have all sorts of shopping. Cedar Park has Lakeline mall and RR has the outlets.
Both are heavy on sports leagues of many types, including soccer. Football, baseball, basketball, ice skating, equestrian, etc...
Both towns really don't have anything BUT nice neighborhoods. There's really no bad side of the tracks. Paloma Lakes, Teravista, Brushy Creek, Sonoma....those are a few nice ones in RR. Someone else will post more
Things to do....What are your interests? Both have things to do like indoor playnasiums, skating, bowling, movies, sports, outdoor activities, waterways, parks, boating. Round Rock has the Dell Stadium for minor league baseball.
I'd say family life is pretty great in either town. Lots of young families in both areas.