Apple Notes is unbeatable for what it does: zero-friction memos, sketches, and iCloud sync across your Apple devices. Nothing to learn. Nothing to configure. For most people, "open Notes and start typing" is the gold standard of capture speed.
Mindly is a different job. A second brain for everything you save (links, files, voice, video, snippets, more), automatically tagged and summarized, and explorable on a mind map. Not a stack of pages, a network of ideas.
Plenty of people use both. Apple Notes for groceries and quick captures. Mindly when one library of mixed data and automatic organization actually matters.
The honest moment of truth: when you try to find that link you saved in February, that voice memo from a walk last month, and the PDF a colleague sent in March, can you do it from one query? Apple Notes is excellent at the first step (saving) and weaker on the second (retrieval across mixed media). That is the gap Mindly is built for.
It is also worth saying out loud: Apple Notes is free and ships with macOS. Mindly is a paid Pro tier on top of a free base. If your needs are genuinely covered by Apple Notes today, the right move is to stay there. Switch when the cost of not having structure starts to outweigh the friction of adding a tool.