Only your ears and fingers can tell you which performs better (for you!). This is one of those scary questions like 'which religion is best' that you can only decide for yourself.
But Mike is right... the Korg is way more expensive, and has (unexpectedly!) more functionality, a sampler, extensive voice editing, etc., etc.. Pay even more, and you will get even MORE sounds and functions... But whether they are better for you is up to you to decide.
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An arranger is just a tool. What matters is what you build with it..!