So there you have it, one has what the other doesn't have ....
it's your pick?....unless you want to go and deal with an Audya & it's upside & downside also...or go module BK7m & controller, or even the Varranger & controller, or any of the past models that may work out better than any of the above mentioned? Or even use a Synth like the Kronos or MOxf great sounds and create your own backing styles using arpeggiators etc and play on top...lots of choices for the savy musician....good luck what will you choose?