QuoteSo you are a Linux user looking for the most secure Linux Distro to secure and maintain strong privacy for your operating system? Here are the Top 15 Most Secure Linux Distros for Privacy and Security Concerns for Linux Users.
The author's English isn't top-notch but the article is a good survey of some security-focused Linux distributions (distros).
https://www.ubuntupit.com/most-secure-linux-distros-for-privacy-and-security/
I meant to add that the author seems to mix privacy-focused distros with distros designed to probe systems to find security vulnerabilities (pen-testing). Those are two different things, although pentesting distros are likely better at protecting your privacy. Kali, for example, is used in pentesting. But you wouldn't use it as an everyday distro although you certainly could.
It's still worth checking out. There are some listed there I hadn't heard of.