Obviously, the test is rather unscientific from a raw numbers perspective, but it does offer a reasonable approximation of real-world performance differences between the iPhone 6 and the high-end offerings from Android. Choosing different apps to test would also likely yield different winners and losers.
Much of the slowdown seen in the Galaxy S5 is due to TouchWiz. Android users willing to customize and tweak the system will be able to eek out a better result. This is simply a test of how most users will experience app launching from a newly-purchased system. Watch one of our previous videos to see how the iPhone 6 compares to previous iPhones.