Our SMB design office is media-heavy, with lots of very large raw photo shoots and source video files. We've been using Apple Server for file sharing for a long time (running on Mac minis). All other services have been migrated or abandoned. At some point we need to switch to a Windows or Linux SMB server, cloud storage is still cost-prohibitive with the file sizes we're throwing around.

edit: File sharing was on Server.app, now it's just plain macOS-flavored SMB