I enjoy booklore, was easy to setup. I don't think its very matureyet though. Just updated last night and an annoying bug where sometimes books wouldn't show up after import has been fixed, so the upside is active development!
Honestly most of these look to be almost the same so I'm not sure what the key defining features would be.
I use filen.io. encrypted and the barrier to entry is really low. Only gripe is that the CLI tool doesn't support cron jobs yet.