I have Obsidian (for notetaking) because I was considering switching because of the knowledge graph/linking, but ultimately remained on Coda because you can change the font colors and highlight stuff in different colors, which satisfies my color-coded brain (plus the Pro plan is free with a student discount).
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You can do that in Obsidian with extensions or css 
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There are endless discussions about note taking apps on hacker news for those who are interested. My own minimal requirements are:
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organization within files, eg via text folding
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links to open other files from within the file
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simplicity and portability, ie text files
Common and well supported programs like vim and emacs can provide all these features. Also, I am probably forgetting a million other features I use all the time like searching, navigational shortcuts, general customizability, etc.
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