boy

Im replacing the chain on my 08 tricross sport for the first time. I went to my local bike shop & they told me a 9 speed chain was what i needed, which conflicts with the bikes documentation which states its fitted with a 10 speed super narrow.

A total newb question i realise, just want to get the best chain for my bike. Ive also been interested in a quick release chain, anyone recommend any retailers that may have one suited to the tricross?

Any help would be greatly appreciated,

thanks