Arch gives you a PAX/Grsecurity kernel which makes your system orders of magnitude less insecure than what CentOS gives you. You can use Grsecurity RSBAC featur

Arch gives you a PAX/Grsecurity kernel which makes your system orders of magnitude less insecure than what CentOS gives you. You can use Grsecurity RSBAC features if you need access controls. In terms of security though, Fedora is getting better since it is defaulting to hardened packages but no hardened kernel.