Don , and styles and sounds and internal speaker ...if u had to compare?
internal speakers I guive the nod to Yamaha s970
where the korg lacks is in the amount of styles available vs yamaha..there are workarounds, conversions, third party styles, create & record your own, etc if your willing to do the work for your needs,.....honestly you cant go wrong with either korg or yamaha at this point as we really dont have many arranger choices anymore like years ago....good luck