I don't know much about either complex other than Flintlake is located in the middle of a very nice neighborhood (Arrowhead). We lived in a rental house in Arrowhead when we first moved here and enjoyed our stay in that area until we built a house.
Here's a link to ratings on both apartments as well as some reviews. Keep in mind that no apartment complex will have a 100% rating because some people are never happy. But, it's a place to start.
Apartments near 29579 - Apartment Ratings
You might also consider Palmetto Pointe Apartments. I've heard positive things about them.
Good luck with your move!