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(Anyone who has read my comments will know that Debian is my choice when it comes to linux so I won't harp on about that.)
The biggest problem I find with choosing a new distro is that every single one of them feels like essentially the same thing. Beyond what gets chosen by default for you can usually end up with the same product/packages/versions you desire in any combination you want.
Most people at least semi knowledgeable with linux know how to get these things and those who don't will settle with what they find comfortable and probably stick with it.
Every time I get bored and look for something else to play with I end up back where I started. I haven't seen enough value in actually changing to something else because I don't see the difference.
Has anyone changed distros to something that wasn't a parent/derivative of your old distro and stuck with it?