you can't link the two together.
the Korg, being a DSD recorder...has no time snyching abilities w/a PCM recorder like the SD boxes. Although, the Korg *can* record in regular PCM too.
out of the box, the SD is probably nicer.
but...that is a matter of opinion.
the Korg is really nice too. I love its sound. and running "line in" (with an external preamp)...then it really sounds amazing.
the SD ...it ain't no slouch. they are popular for a reason. as you know, built like a tank. You can drive over one w/a truck and it will still work.
the Korg is not nearly as rugged. but, it is what it is.
the audiogate software is pretty sweet. Lets you combine the files and export the raw DSD into any PCM resolution you want.
If it were my money...I'd go korg. and then maybe spend the "extra" that you saved on a preamp to put in front of it. Apogee MMP, V2..etc etc.
that would be hard to top, at any price point.