Personally I find Apple Notes the most convenient for quick jotting down of ideas etc. It’s not the most advanced in terms of features but it loads instantly, is quick to use and is available on all of my devices. Have tried numerous alternatives but they’ve never stuck e.g. they’re slow to start up or are fussy to use or don’t work well on one platform. For deeper sketching out of ideas, diagrams etc I really like C…
Why?
Because several times now I've lost notes due to Apple's cloud "sync." On a few occasions, the note turned up in the trash (with no action on my part) or simply disappeared.
Putting aside the spontaneous deletes, one thing that seems to more frequently push things into the trash is editing the same note on more than once device - the handling of this on the icloud backend appears to be "hell, just delete it."
edit: I should note that this spontaneous delete thing was more common a year ago, but then again, I've dramatically reduced the number of notes I maintain, now down to like 30 or so as opposed to the hundred+ I used to keep.