For me anything that uses the debian packaging system is good. I was in the past a SUSE user because I prefer kde and SUSE is more kde geared, but was never a fan of rpm packaging system, Kubuntu severs me well in both respects as it also allows me easy access to gnome apps where they are needed, and so its parent Ubuntu get my vote.

I would also like to make mention of DSL for specific purposes where a small footprint is required.