The ODroid U3 surely rocks the house. With 3 usb port it can fit any combination of external control you would like [Launchpad, nanoKontrol, Audio out, …] , a processing power that blows the Rpi to dust, it shines it the best standalone cpu platform I’ve come across so far.
Installation-wise, I installed arch-linux and compiled my synthesis framework in about 3h without a glitch (except for the built-in audio not being recognised by ALSA), and it auto-boot to any app in about 13 seconds.
I enjoy now close to unlimited number of Braider voices while the Rpi puked on three.
So, no matter whether you want to write synthesis software or use any of the Linux classics like pd, super collider, etc.. I’d hugely recommend it.