I believe recently there was a discussion re. notes app. For example this one - https://discuss.grapheneos.org/d/5893-modern-local-markdown-notes-app-for-android
Also, it's really a personal preference, so "the best" is very, very subjective.
I like Joplin, not in every aspect, but maybe because I'm used to it. Used it for a long time. And it fulfills my needs. Obsidian and Notesnook look very good but they don't give me the way I prefer of creating notes and navigating between them. Again, the way I'm used to. :)