Crime is low in the Mitchellville area. I would contact the local police dept. for crime stats in the area. There is a website,
www.crimereports.com , whicdh is very useful. My check of Mitchellville shows very low crime in general compared to surrounding areas.
While it would be nice to high more high-end stores within Prince George's, I still manage to spend much to most of my money in the county. Macy's and some of the other stores are fine for me; while the presence of high-end commercial and retail is important, I personally don't need it to be happy here. My neighborhood is quiet. While one child attends a mediocre school (that mainly is a function of how the school is run, not an inability to obtain a good education), the other child's school is a top-ranking elementary in Maryland.
Good luck.