I haven't heard of this "citizendium" site you mention. Wikipedia is a pretty authoritative source though, I reckon.... because of the dedicated moderators cleaning up the junk.
citizendium is also looks like wikipedia its very new and still need to develop. My choice is WIKIPEDIA>> Dilpreet
Wiki all the way .. i recently did some editing in the chemistry section as i was researching but i think it is pretty good and the most trusted.
never heard of citizendium before wikipedia by a long, long way judging by what I've just flicked through on citizendium
Ya know I never heard of citizendium. Probably some random site that's trying to copy Wikipedia. Go Wikipedia!