In the same order you asked:
Safe, easy to use, polished and reliable ; Someone else tried to emulate the first one success ; Poorly executed open-source alternative you can selfhost.
All of them speak the git and are essentially web UIs made to manage it and the creation of repositories and setting up permissions.
Here’s typical Mozilla not being the all mighty savior people think of them.
Firefox offers better privacy and security than Chrome, with upcoming support for 200 new add-ons.
Also built in spyware and a LOT of snitching to a 3rd party analytics company that can be disable in flags.
If you’re serious about privacy use LibreWolf or Ungoogled Chromium if you’re reasons that required the Chromium dev tools.
Yeah I use Joplin as well it’s good but I can’t say it looks good. They could just copy the UI of some other app and it would be the best note app ever. Another thing missing is a web version that doesn’t require syncing everything to the browser storage and themes in iOS.