Watched this video with my wife last night on our big screen TV.  My wife said she liked the Korg better  and  she doesn’t have a horse in this race 

 She said the rhythms had more “ drive” on the Korg. 
Honestly, neither of these models inspire me to upgrade from my Yamaha psr 950. I don’t hear much difference but maybe the features would make an upgrade worthwhile?  The TC Helicon vocal processor, chord sequencer, lively sound,  would sway towards the Korg, if I was given the choice.... 
Anyways, I do enjoy so much Tony’s(Booners Music) demonstrations.   He plays great but he doesn’t get in the way of the keyboard, so to speak.  He lets the instrument speak for itself.