I prefer number 1 and that is only because I 'think' it sounds more like the PX-5s I use. Knowing that my ears are not the best these days mean that I may be totally off base but that is what it sounds like to me. Both have a great sound in my opinion and I would be satisfied with either. With that being said, I'm glad I didn't have to pay as much for the Casio as I would have for the Nord but even if the price difference was not that much, I'm still a happy camper with the PX-5s.
Anyone care to share their opinion of which one is which yet?