I’d like to sync my markdown notes between devices (laptop and phone), which service is better: Nextcloud or Syncthing? Any other important idea I should know?, like latency times, or maximum number of synced devices, what if I edit the same note from both places without internet and then both get connected to a network… For example, I know Nextcloud let me have a history of the notes.
A self hosted Joplin sync server is also pretty nice.
does it support plain markdown?
IME joplin has its own format
https://joplinapp.org/help/apps/markdown/