This is nonsense. Safari is the only mobile browser available on iOS, so if you're sorting by mobile available per platform, then of course it's the "best [of one]". If Chrome and Firefox had the opportunity to bring their platform fully to market on iOS, there would be some real competition there... They could still do what Android does with displaying any in-app web rendering like Android System WebView, while allowing users the option to use the same browser and experience they're used to on their desktops.