Depends on what you want to use the mount for. Different devices may require different mounts even though many are defined as universal.
I have the grip mount with the one inch ball, which is spring loaded that holds your device but a couple of the grips end up compressing the side buttons on my phone so it either turns it off our turns the volume up to max if I position it in the center. So to compensate, I have to place it at the very top or bottom, which is very close to the edge of the grip but it hasn't come off. But kind of a big PIA since there is very little wiggle room to hit that sweet spot.