I use SnipNotes. I needed something that would sync between Mac (and MacBook), iPhone, and Apple Watch. Nothing else seems to do it. I like Apple Notes well enough, but I needed Watch access.
It's not free, and I paid more for Mac access (iPhone and Watch alone was cheaper), but it's not a subscription, just pay once and it's yours. Sync is I believe through iCloud.
My only gripe is that the Watch app constantly notifies me that it can't get online. Just about once a day, I think. I can't bring my phone in to work, hence needing the Watch app.