the snubbers work by contacting the car under body as the differential pivots up when the car accelerates. Of these two the length difference is 3/4 of an inch, into a hard piece of rubber. The longer snubber will make contact first, as it will have a greater rate of change for the same amount of axel rotation, but with the difference in length being such a small percentage of the overall length, I don't see much between these two.