Yeah good idea and an interesting topic, these threads do have a tendency to degrade into gear discussions though 
Personally my setup is iPad3 with Cubasis for MIDI and rec, i use SoundPrism Pro as “keyboard”, and there’s a few synth apps to fulfill my tweakish needs. (Most prominently the Sunrizer, that thing’s a monster!!)
If i feel the need to tweak physical knobs, i connect my Zero Mk2, though through a hub with it’s own USB power “supply”…
Dave