I started off using SuSE linux in 1998, since then I have used Slackware, Debian, Ubuntu, Mint, Fedora, Red Hat, and even FreeBSD (Not Linux).
Overall I prefer the feel of Ubuntu and find it to be the most servicable, however I have always found Slackware to be the most custimizable. At the end of the day, I've never been able to be as productive under linux as I have under windows. But I use Linux for file storage and service. I also use it for our whole home router.
My dream is a MAC lol
Aero