What's a better sync between android and Linux? Syncthing or FolderSync or something else

Use cases:

1. I need some files on my phone, e.g. tickets in PDF format.
2. I want some files from my phone on my desktop, e.g. downloads i want to keep long-term.
3. I need to clean up files no longer needed. I prefer to do this on a desktop file manager.

Syncing a folder seems logical, but how exactly? I'm considering syncthing (local network suffices), foldersync with ssh on local network, or nextcloud (prefer wifi only).

For 1, i need to find that folder easily.

For 2, it should be obvious how to safe to the sync'ed folder from any app. Bonus points when there is an option to include the Downloads folder or share from Androis apps.

Ideally the sync will happen as aoon aa bith devices are on the home wifi.