Other then what has been already mentioned (chiefly commercial 3rd party software support), I enjoyed the set-up time. Now there are better provisioning methods, particularly when setting up hundreds of hosts, but when doing it naïvely for a single or few hosts using the interactive installation software, I preferred RedHat/CentOS. That got me to a booting system in some ten, fifteen minutes, while the dreaded installation in Debian used to take easily 1.5h. Once installed, I found Debian easier to maintain and upgrade in place, but initial installation was a time-sink for many years.
To also comment here: every red hat system boots from dracut. There's no separate PXE for netboot: provisioning is consistent whether your boot medium is local, LAN, or ephemeral. It ships netboot-capable out of the box, and this is huge.
