I own a Cordoba C9 and chose it over a C10. I preferred the tone of the C9 and it felt lighter and more resonant. However, I recently went to a store that had a C7, C9, 45CO, and a Ramiriez R-1, and I thought the C7 sounded the best and projected the most. I think there is enough variation with each guitar model that the best you can do is try all the guitars you can and pick the one that most appeals to you.

I strongly prefer a proper classical guitar neck (52mm nut, 42mm string spacing) and 57-59mm string spacing at saddle when it comes to nylon string guitars, even when playing non-classical music. I owned a C9 crossover and loved the tone, but after playing it for a while did not get along with the 48mm nut and tighter string spacing.

Hope this helps.