I've had both the Stimpson and the Hiker. I like my Hiker a lot better for 3 reasons:
- Love the tray to put the grommets in
- You can adjust how tight the grommet crimps (if the Stimpson is adjustable, I never figured out how). We grommet foam core which would get a pretty heavy dimple in it with the Stimpson.
- The angle on the handle is more ergonomic. I used to have to climb on my table or stand on a step-stool to put enough weight on the handle to set the grommets on the Stimpson, the starting point is different on the Hiker so it takes quite a bit less effort to set the grommets. Personally for me this was the biggest benefit - the rest was just icing on the cake.