I want to love Joplin (open source! markdown!) but I just can't get past how ugly it is. Its iPhone app is just a horrendous mishmash of colors and non-native UI elements.
[0] https://github.com/amandamcg/joplin-theme [1] https://discourse.joplinapp.org/
No affiliation, just a happy customer. :-)
I have even stronger feelings about Roam though. Notion is "better" than just abt anything else like it, whereas Roam is different -- there is nothing else like it.