In my personal experience and for my personal needs smb has worked best for me even though it feels kinda “bad” because of the windows background. However that also makes it useful, too, as it is compatible with most os’es…

Security setup is easy. Performance good (in my experience better than sshfs but i am sure sshfs transfers are more secure than smb).

This comes closest to what i am looking for…thanks…

Looks like it does not have user registration, does it?

You mean https://www.liquidfiles.com/? I prefer open source…

Does it offer user registration?

This is a bit overkill for my purposes…i just need the filesharing part…