What I'm pushing for is open formats + git for sync. That way, you can easily combine different tools. GitJournal is never going to do everything, the note taking app world is way too complex.
Instead, my plan was for GitJournal to be one other tool in your workflow.
I'm a fairly happy user of Joplin - it's great if you want a synchronised cross-device markdown editor!
I write "fairly happy", because there is a longstanding issue with the Android app where notes that have more than 10 lines start to experience crazy lag when editing. So I mainly use the desktop version for writing.
https://joplinapp.org/