I'd like to agree and say joplin is great. I use synching to make sure my jolin notes are automatically synced between my phone, home computer, and work laptop
Joplin does not offer any original synchronization system. It just offers NextCloud, Dropbox, Onedrive, Webdav or the local filesystem. If you don't use any of those services, or you do not have a server where to setup Webdav, Local filesystem + Syncthing seems like the best choice.