Hi,
I’ve basically been a Korg user for over 10 years. Had a couple of psr’s during that that period, but only as a second keyboard.
Recently sold my pa3x , Pa4x, and bought the sx900.
For anyone who is heavily into style/editing creating you can’t go past a Korg. Only ever had the top of the line so don’t know how the pa 700 fits in as far as editing functions go. My Pa4x had pretty much everything one could want.
It was my hobby converting styles from other manufacturers across to Korg.
Decided to give it up and actually start playing again so swapped over to Yamaha. A lot more stuff available including commercial products.
I also prefer Yamaha styles, for the type of music I like to play.
Sounds and styles are subjective.
Pick the keyboard who’s styles best suit you, and what sounds best to your ears. If either fit that category, then maybe look into the functions. I never had a problem with Korg operating system, but I came across quite a few Yamaha owners who decided to give Korg a try, that had problems adjusting.