Heres a quote from the yamaha site(US)"Even if you've never played a keyboard in your life, the DJX lets you sound just like a pro -- the minute you get it out of the box!"

and if you dont believe this just listen to Maryland's tunes. Hes obviously a beginner!
Dont buy either!!!!
Go to a music store(not a k-mart or best buy) and check out whats available(you will notice that a real music store does not sale DJX's or any casios or any of the other TOYS.
Dont take advise from people who dont know shit, ask a professional.