Generally I think the Yamaha is probably more consistent and I've heard decent enough reviews. If that is the older Cordoba C5, then that's likely a Portugal one and I've heard they can be all over the place. But for those that sound good, they sound pretty good for their price.
It looks like you are in Southern California? You should try checking out some of the local classical guitar places too to see if they have student level guitars in your price range. Trilogy Guitars and Los Angeles Classical Guitars come to mind. And if you are ok buying site unseen (which in my own opinion for a student guitar, is not that bad) you find find a better value.
:: ESTEVE 7SR | APARICIO AA52 | SAEZ MARIN 715