Are these the only ones? Considering ipad is regarded as a viable music making platform it does surprise me there are so few apps. Which of these 3 would you consider to be better? Or are the sounds gonna be liked based on personal preference? Do any of the apps sound fuller than the rest?

Casio Privia PX-5S ::: DMC-122 with Gemini Module ::: Novation Launchkey 61 ::: Roland CM-30 Speaker ::: Ipad Mini 2 with a lot of apps for live playing (Korg Module, Galileo organ, Thumbjam, etc.)