Well, Chromium is quite popular with the security conscious on Linux. At least it was when I was using ArchLinux, they had some good custom build script versions.
Some particular build of Chromium and Chrome are vastly different systems. A lot of this is philosophical; The Mozilla way is to support standards and tut-tut at websites for doing overtly malicious things like looking at user-agent or asking for widevine, the Chromium way is to treat the web as a hostile actor and offensively subvert anti-user behaviors.
Any modern browser that doesn't actively fingerprint as either most-common Chrome on a laptop, most-common Android browser, or most-common iPhone is written by such hopelessly naïve nerds that they shouldn't be trusted with user-facing software with real security considerations.
Security conscious and privacy conscious aren't the same thing, although there's overlap. I can be concerned about the security of my system without caring about whether I'm being targeted for ads.
This is untrue, but frequently misunderstood: Privacy and security are two facets of the same problem. If you don't have security, your privacy is at risk. If you don't have privacy, your security is at risk.
Case in point: Many of those targeted ads contain malware. :)
