Both! In fact the end result should be the same with some improvements for some use cases. The goal is to have all the Quattor dependencies provided by the OS installed as part of AII_OSINSTALL_PACKAGES (yum installed by Anaconda) rather as EXTRA_PACKAGES (explict RPM command added by aii-ks, requiring repository resolution). This has no impact if you are using AII 13.2+ but is important to help deploying machines using Quattor 13.2+ with AII 13.1.x.

The alphabetic sort is certainly not required but I find it easier to find if a package is installed this way...

Michel