I have both.
Either will work on my 10x 42 or 15x56.
I prefer the taller one. NO less stability with the taller one. Gains you more height on your setup and I feel is more user friendly.
Well, I got over zealous after I posted this and called them and was talked into the short one. It already shipped so ill check it out when it gets here and I'll swap it out if I think it is worth it.
Thanks for all the input. I should have waited long enough to see the consensus form on the taller adapter.
After using both I see no good reason to use the short one honestly. With my 15's its hard for me to tighten/loosen the quick release screw when using the shorter one because the objective lens sits too close.