The Scotts and GPR have some different features. Scotts has a sweep width adjustment, high and low speed circut adjusments, and no resistance coming back to center. GPR's sweep width is fixed at 15deg, has only one circut adjust with 24 positions, has some resistance back to center, and free lifetime service and upgrades. I have tried both and liked the GPR better. The slight resistance back to center kept the wheel steadier around corners when hitting rocks and roots since it didn't snap back to neutral so easy and the big adjustment knob is easy to adjust while riding.
Since your almost next door to GPR consider getting one. I got mine from them last year while at a race at Gorman. They installed it for free. I saw them at a race this January and they took it off, serviced it, upgraded it, and put it back on for free plus you can find it for $75-$100 cheaper than Scotts.