I have used almost all the major distros out there.
- Slackware
- Redhat
- Fedora Core
- Suse
- Centos
- Debian
- Ubuntu and variants
- Freebsd (not linux but hey its cool)
- Some random stuff I can't remember
Then a few years ago I started with Gentoo, stuck to it for a very long time but got really upset when I had to do work but wait for updates and compiles ect. No other distro could get close to it, it was a favourite of mine for a long time.
That is when I found Archlinux. At first it was not exactly Gentoo but very close to it. After 2 months with Arch as my only distro on my pc at work I found a new distro that is everything I wanted. So now its Arch on the laptop, pc at work, pc at home and even some of the servers. I found it to be a lot less troublesome than most binary distros and source based distros.
Personally I feel at home on any distro I touch and can do everything in all of them, but my preference became permanent to Achlinux.
Most servers though still run on Centos as it work very closely the same as Redhat Enterprise Linux.