Some riders like to carry a shock pump with them, and if you’re out for a multi-day adventure or love to obsess over pressure, then you want to make sure you choose a pump that’s small and streamlined enough to fit in your pack without taking up too much space or weighing a ton.
On the other hand, if most of the set up you’ll be doing is at home or at the trailhead and the pump will be staying behind, this is less of an issue.
But one thing that is worth considering is how ergonomic it is to use. That pumping action can get very tedious if your hands keep slipping or if the pressure release valve is right where you want to hold the pump body.