Well, having no stake in either one of these keyboards, perhaps I can offer another opinion? LOL

They both sounded equally good. Amazingly similar, to be quite frank, coming from different manufacturers. Neither, to my ears, had any commanding lead, and both, if played well (like the demonstrator did) do a very similar job of convincing you you are listening to a real guitar.

I think the only minor differences I heard were more to do with subtle differences in velocity response and key touch. Obviously, there's a vast difference between the FEEL of those two arrangers' actions (something no demo is ever going to show you!) and this is likely to produce some differences (I felt that the Korg had a hair more range, but also feel that was more to velocity response than actual sound).

But overall, in these kinds of shootouts, it's better to have them be 'blind'. One always looks for vindication in one's purchasing decisions, and seeing each keyboard played, especially when two such almost identical sounds, always tends to influence the decision. Simply LISTEN (close your eyes) to this and start it randomly in the middle, I have my doubts many can tell them apart..!