Backyards are different than frontyards. Your backyard is considered your private space and you can put a locked fence around it, store your stuff in a shed, put in a swimming pool, etc. You are more restricted with a front yard.
If I had the choice and I was forced to allocate, I would choose 100% backyard and 0% frontyard.
In my experience, urban parks do a much better job of this than backyards do. Urban density means more neighbors, and parks with other kids are much more appealing than backyards without.
If I had the choice and I was forced to allocate, I would choose 100% backyard and 0% frontyard.