They're all great apps and great services. I think OneNote is inarguably more feature-packed than any of them. Evernote is clearly the most ubiquitous of all of them. But for me it comes down to two things in Apple's favor:
Ease-of-use:
Apple's Notes app ships on every device. It syncs with every Apple device. It's scriptable (if you're into that sort of thing). It doesn't have any financially-driven limitations. EVERY other notes app does has at least one of these limitations.
Reliability:
It's made by Apple, so there is no danger of it going anywhere any time soon (if ever). It's always going to be updated and compatible with the latest version of macOS and iOS. They aren't trying to make money with it, so Apple is more inclined to keep it user-friendly.
Bottom line:
Evernote is about one year away (two at most) from bankruptcy if it doesn't sell-out to a larger company. There are too many options out there to play their silly games and live with their restrictions... and most of their users have figured that out. Either way, Evernote as we know it now (which is also dramatically different than when it started) will be going away. And that's the problem with these small, third party apps & services—particularly free ones.
OneNote is quite nice, and MS doesn't need to make money off it for much the same reason as Apple. The problem here is that MS has shown that more often than not they are more than happy to kill an app or service if it isn't a money-maker.
Apple's Notes app is the least feature-packed, the least ubiquitous, the least "friendly" app of them all. But it's the only one that's guaranteed to be here tomorrow, the next day, the day after that...