Comparing iScroll with Scrollability on iOS5, the former feel like gliding an object on the regular desk (in my case - iPhone 4), while the latter feels like ai

Comparing iScroll with Scrollability on iOS5, the former feel like gliding an object on the regular desk (in my case - iPhone 4), while the latter feels like air hockey on steroids. That is one makes scrolling stop too quickly, while the other makes it a bit too long. Both seem perfectly useable, and while scrollability feels a little bit better, I would never be motivated to develop something like this myself, iScroll feels perfectly adequate. Perhaps a split-test is in order?