When comparing LinuxKidX vs Hardened Gentoo, the Slant community recommends Hardened Gentoo for most people. In the question“What are the best Linux distributions for misanthropes?” Hardened Gentoo is ranked 36th while LinuxKidX is ranked 109th. The most important reason people chose Hardened Gentoo is:
Your only real options for a widely supported hardened distro are the Red Had distros (Red Hat, CentOS, Fedora) of which Fedora is your best bet for a desktop , or Gentoo. You can make a hardened kernel in Gentoo while stripping unnecessary features, creating a much smaller attack surface, and using in-kernel mitigations others don’t.
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Pros
Pro Live CD
With the Live CD users can test and use the software without having to install the OS. The Live CD will also function no matter the OS on the device at the time.
Pro Supports custom hardened kernels
Your only real options for a widely supported hardened distro are the Red Had distros (Red Hat, CentOS, Fedora) of which Fedora is your best bet for a desktop , or Gentoo. You can make a hardened kernel in Gentoo while stripping unnecessary features, creating a much smaller attack surface, and using in-kernel mitigations others don’t.
Pro Comprehensive hardened guide in wiki
From SELinux to PaX to AppArmor to.... The wiki has got you covered.
Pro Fully customized kernel that prevents server-side malwares with SSO mechanisms
Out of CentOS /RedHat/Fedora a hardened kernel is very easy to make.
Pro Best defense against NOP-sled malwares, even with ROP/COP mechanisms
Out of CentOS/RedHat/Fedora/OpenSUSE/Slackware/FreeBSD/Mandriva and Arch, only Gentoo can best protect you against NOP-sled malwares, even with ROP/COP mechanisms.
Cons
Con Much of the support material is in Portuguese
LinuxKidX does have an english language version, but much of the support material is in Portuguese, so finding help if issues arise may be a problem.