I'm currently using Apple Notes on my Mac and iPhone. It works just great! It synchronises perfectly I can drag and drop images to it, no problem. Cmd + C, Cmd + V, Cmd + B, Cmd + I all work as expected. I can even add to-do lists and cross out "Done" I think it even supports tables, But I don't use them. Export as PDF, html, airdrop, email whatever, works easily What doesn't work: If I ever get out of Apple ecosyste…
Useful tip (that I didn't know until recently) is you can also access your notes via any modern browser at https://www.icloud.com/ I recently moved to a Windows machine as my day-to-day home machine and thought I'd have to abandon Apple Notes (which I use on my phone and my work Macbook) but the web interface is basically identical to the apps.
But if iCloud Notes is just as good, maybe I'm wasting my time. I trust Apple's security, and Notes really is exactly what I want as a dev (their limited markup is nearly as useful as markdown, and I love that it is limited to a few choices).