From the Youtube demo I'm pulled to the Korg but really that means nothing unless you play them in person. It "seems" a tad richer but who can tell from a video. For the price difference it should give you more. I love the look of it too.
I'm sure the Yamaha will do all you need so enjoy it.
Did you look at the new Casio Privia's ? Curious to know how they would compare.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer