Here is my set up. It's a Ram mount with 5" Tough-Track. The other ball is for future devices or a GoPro (but I havent bought anything yet). I had the Scoshe magnet mount also (see side), but didnt really like it; the phone would fall off often when I went off road. Now I just use the magnet to attach the Apple Lightning cable head when I exit the vehicle.
RAM(R) Tough-Track™ - Top-Loading Composite 5" Track