For me it is far more than sound that makes the big difference.

Take away all the "twiddly" bits, you know all those silly dinky little single note fills and such that make up a HUGE part of the Yamaha style base, then remove all the effects (apart from system rev), and break the styles down to a basic three instrument setup (bass drums guitar - or even just bass and drums) which is what I do most of the time...and THEN you hear a big difference in exactly what is better or not. I am not even going to mollify it by saying "different".

And then to cement it play the style over say 32 bars and THEN see if you think Yamaha styles stack up against the Korg styles..

For one finger plonkers, or those happy to have the full Mantovani orchestra or Glenn Miller big band thumping away destroying any musical credibility, but certainly keeping one amused - well fine...but not for me.

Yes the Yamahas sell a lot, but let's face it, I daresay the majority of sales go to home users, who probably also have not changed their vote for 60 years either...or brand of underwear