NFS v4.2. Easy to set up if you don't need authentication. Very good throughput, at least so long as your network gear isn't the bottleneck. I think it's the best choice if your clients are Linux or similar. The only bummer for me is that mounting NFS shares from Android file managers seems to be difficult or impossible (let alone NFSv4).
Yes, that's what at least the `nfs-server` service on Fedora does by default. And VLC also supports v3 on Android… maybe they use the same implementation as Kodi behind the scenes? It's weird the v4 support is so spotty still, even though it has been around for two decades. Even NFS v4.2 is almost ten years old at this point.
SMB is great for LAN, but its performance over internet is poor. It remains SFTP and WebDAV in that case. SFTP would be my choice, if there is client support.
I just use sshfs for most things today. It's by far the simplest to set up (just run sshd), has good authentication and encryption (works over the internet), and when I measured performance vs. NFS and Samba some years ago it seemed roughly identical (this is mostly for large files; it's probably slower for lots of small files – measure your own use case if performance is important). I don't know about file locking and that type of thing – it perhaps does poorly there(?) It's not something I care about.
> What are most people using today for file serving?
Google Drive. Or Dropbox, OneDrive, yada yada. I mean, sure, that's not the question you were asking. But for casual per-user storage and sharing of "file" data in the sense we've understood it since the 1980's, cloud services have killed local storage cold dead. It's been buried for years, except in weird enclaves like HN.
The other sense of "casual filesystem mounting" even within our enclave is covered well already by fuse/sshfs at the top level, or 9P for more deeply integrated things like mounting stuff into a VM.
As nice as WebDAV would've been it's probably a non-starter in many scenarios due to weird limits, like Windows has a default size-limit of 50mb.
I'm tinkering on a project where I'd like to project a filesystem from code and added web-dav support, the 50mb limit will be fine since it's a corner-case for files to be bigger but it did put a dent into my enthusiasm since I had envisioned using it in more places.
