Hi Steve,
My main keyboards since 2008 have been the 3 korgs , pa 800, pa3x, Pa4x.
I had a psr s950 during those years, but , never really played it much, I just used it as a source for converting styles to Korg.

I was vaguely familiar with operating system, but, really just learnt the basics to give me what I needed, ie load a style, create a song in step time that I then imported into the korg to create a Korg style.

I decided I actually wanted to start playing, Yamaha styles were the ones that suited me best, so decided to get the keyboard who’s styles I liked, rather than keep on going trying to turn my Korg into a Yamaha.

Took me a couple of weeks to familiarise myself with the Yamaha operating system, because it had changed even from the psr s950 I previously owned.

The korg and the Yamaha do sort of have some things in common .

The one thing I thought I would really miss was my ec5 pedal board. I’m not the fastest at pressing buttons , for variations and fills etc so I used the board.

The Yamaha only has the 2 pedal inputs.

Anyway , the great thing I discovered on the yamahas are the registrations. I was able to save the data I needed for a song on up to up to 8 different registration buttons, and a registration sequence, and I just needed the one pedal, to get me thru a song.

I think over the years on the forums, I came across more Yamaha players that had difficulty adapting to korg’s , than vice versa.

You really should try one first, or find a store that will take returns if you don’t like it, just in case you don’t like it.

You have Yamaha fans, you have Korg fans, some adapt nicely, some don’t.

Good luck with your hunt.