UpNote vs Bear
UpNote is very similar to Bear, both in terms of features and aesthetics. It's biggest plus is that it is available on all platforms, while Bear is an Apple-exclusive app. Both apps use tags to organize notes, while only UpNote allows grouping notes into Notebooks in addition to that.
Bear stands out as a slightly more polished, aesthetically pleasing product. Like UpNote, it also uses Markdown to format notes. Unlike UpNote, it does not hide the Markdown syntax, which can be either a minus or a plus depending on your preference.
Fan of beautiful note-taking apps? 🤔
Maybe Paper is what you're looking for.