I have tried the Samsung and Microsoft one, and I have to say that the Apple Pencil is a far satisfying experience...
I owned the larger iPad Pro with Apple Pencil and while I do agree that it's operates more smoothly than the surface book/pro and possibly the samsung line. To me it's about use cases.
On a phone, as with how many use the note. I'd 9/10 use any pencil to take... notes and with that in mind. The Apple pencil would already be eliminated for me due to it not attaching to the phone.