It's a tough decision to make, but I believe it is a decision best made yourself.
I see that you posted the question twice, so please view my answer at your first question. Since I live near Cobblestone, I can tell you a lot about the area. Feel free to contact me if you have any specific questions!
First things first you need to find a realtor to help you wade through this purchase.
Stonemill Farms is a more established community and it appears that you are already familiar with the area since you list yourself in Woodbury, MN. The reality is that the crime will stastically be similar in each of the neighborhoods and that only leaves schools for you to consider. Be sure to look at the district as a whole and not just the local elementary school since some districts have great elementary education but the highschool leaves something to be desired or vica-versa.
Good Luck in your search.