I still think the amount of pro players (those being paid) using Korg arrangers is still minuscule compared to the amount of home users. It is about the same with Yamaha.

As far as one type brand user being more "advanced" (or "pro" if you like) than another?

Again, just because a person knows how (or is able) to deeply edit styles or "customize everything" (or has the means to do so more extensively) doesn't make them a more proficient or advanced "player".

It still requires "talent". Several SZ music contributors do absolutely no editing, style-wise or voice-wise, and their music is first rate...then, we have some who do a lot of editing, adding samples etc., and it is still first rate.

As one SZ'er has as his signature, "It's not the keyboard; it's the keyboardist."

That applies just as much to arranger keyboards as it does to someone playing piano.

Ian