I just said what was skewed:/
They didn't take into account the differences between the hardware using each OS.
Show me a comparison of, say, the Nexus 5 on kitkat 4.4.4 vs the iPhone 5S on iOS 7.1 and then we'll have a fair comparison
IMO that still barely matters. We'd be talking a percent of a percent of instability difference between the two. Both are stable, strong, have awesome apps, and the devices have phenomenal hardware.
When it comes to which to get, the ONLY question someone should be asking is "how do you use your phone and what features are important?"