One thing that made me shy away from Seafile was the limitations of its Android client. IIRC it could only upload photos, not sync folders. So couldn't use it for notes, voice recordings, downloads, books...
I considered Syncthing as well, but I wanted both the arbitrary file sync and the web-based features. Figured I'd rather deal with Nextcloud's poor performance than cobble together a crappy Nextcloud clone via three separate apps.
I'm definitely keeping an eye out for OCIS though.
Pretty much exactly the same position. I use NC for file-syncing, WebDAV, and the webinterface for those files only, but it’s not exactly great. But for similar reasons as you, it’s still the solution I’m stuck with for now.
I considered Syncthing as well, but I wanted both the arbitrary file sync and the web-based features. Figured I'd rather deal with Nextcloud's poor performance than cobble together a crappy Nextcloud clone via three separate apps.
I'm definitely keeping an eye out for OCIS though.