I can't believe the vII and VIII hate in here. to me it seemed like XII's Al-Cid left us with the least impression. He was hardly in the story and didn't even look like a Cid.
The Cid in Final Fantasy XII is Cidolfus Demen Bunansa and not Al-Cid from Rozzaria. And the Cid of Final Fantasy XII was probably one of the best Cids ever.