You're confusing two different usages of "security" here. (And you forgot Bastille Linux, Blue Linux, Castle, & Openwall GNU/Linux as well.) And be very careful about using words like "ultra-secure". There isn't an ultra-secure Linux distribution.
These distros are "hardened" to resist exploits and intrustions, mostly by closing holes in configuration and patching vulnerabilities.
SELinux is =completely= different, even though the end result (especially to a potential intruder) is very similar.
SELinux changes how data is passed around inside the kernel and between components.
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You're confusing two different usages of "security" here. (And you forgot Bastille Linux, Blue Linux, Castle, & Openwall GNU/Linux as well.) And be very careful about using words like "ultra-secure". There isn't an ultra-secure Linux distribution.
These distros are "hardened" to resist exploits and intrustions, mostly by closing holes in configuration and patching vulnerabilities.
SELinux is =completely= different, even though the end result (especially to a potential intruder) is very similar.
SELinux changes how data is passed around inside the kernel and between components.