Don't forget about LibertyBSD however it has become dormant and hasn't seen updates in a while. If you're into Libre software though, HyperbolaBSD on a Libreboot system would be cool. Granted there hasn't been any more news on Hyperbola since Jan 2020 either... But if security through obscurity is your thing then that might be worth a look.
For security though you, just practice safe computing. I think it really depends on what you use your pc for and who you may be concerned about losing your data to. As long as you know what your doing, and are not using Windows then you should be fairly "Secure".
Use firewalls and VPN's, don't use google services, encrypt your data etc etc. Unless some secret government department are after you then you should be pretty safe.
Paranoid people appear to like QubesOS