It's not really a very good comparison. Once again, it does demonstrate that whether something sounds good or bad is entirely in the hands of the player. Just about any modern MOTL arranger CAN sound great... but only if you PLAY IT GREAT!
This, sadly, is just OK. Admittedly, it's probably at the top end of ability for the vast majority of people who buy arrangers, and hence the demo will work OK for them. But I guarantee, in the hands of a Marc Parisi, or a Ralph Schenk, our job of deciding which is 'better' would be far more difficult.
TBH, I didn't like EITHER arranger very much. At least, not presented like that! Poor choice of styles (the blues one on the Korg was Mustang Sally, slowed down to the point that the style didn't work any more), poor choice of RH sounds (both those arrangers have better string sounds in them, I guarantee!) and dead square playing.
And what's with comparing factory OTS settings? To be quite frank, if you buy an arranger for how it comes out of the box, God help you! You honestly don't think you can improve on them? Time to crack the manual and experiment with the full sound set and effects...
I think a much better comparison is to give a talented player two arrangers, six songs, and a WEEK to find out how to perform them best. That's what most of us do. You don't just call up the first string sound you find. You don't use the first blues pattern you come across...
And, as usual, I'd prefer if these tests were blind. Tell us which was which AFTER you have played the back-to-back. Too many invested in their choice of gear, here, LOL.
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An arranger is just a tool. What matters is what you build with it..!