I've used both, a stem mount and a clutch reservoir mount. IMO I think the clutch reservoir mount is by far the safest and easiest to use. The stem mount does look good, but for me, the clutch mount is a lot easier. Your attention from the road is far less with the clutch mount. It looks like the clutch mount would block your view of the mirror but it doesn't obstruct it at all. You can see how looking at the stem mount would require moving your eyes further from the road, unless you look directly in front of your bike.