I started with Redhat. Then moved to slackware and stayed with debian for a few years. But then I discovered BSD and have never stepped back. Sorry, but no linux for me!
I use OS X now (which is built on BSD). I am hardcore unix geek though, and I check up on linux regularly. In fact I got RHCE couple of months back for work purposes too. I think it is maturing in all sorts of directions (eg: I like SELinux), but it still isn't for me. Not yet anyway.