Obviously this just comes down to personal preference.

All the major companies have poured lots of money into engineering typefaces specifically for their UI and brand. They're all designed to be easy to read and give off just enough personality to not be distracting. Objectively, I'd be surprised if one were better than another.

I like some of the open source sans serif fonts just as much as Apple's SF fonts. Google's Roboto has a bit too much personality IMO, but it might be better tuned for Android than the web.