I think a lot depends more on availability...

Both arrangers are pretty powerful, but the Korg has dominated the middle east market for quite a while, and very strong in the far east due mostly to the wide availability of styles and sounds already developed for that platform.

Unless you plan to develop your own styles from scratch, and do all your own instrument sampling (a tough job at best, and tougher that Yamaha doesn't support Akai import, where there IS a large supply of already well sampled mideast instruments), and are remarkably skilled in arabic and oriental instrument imitation, I would probably tend to recommend going the established route. Korg's are the dominant arranger in the arabic market, and strong in the oriental from what we are told...

[This message has been edited by Diki (edited 10-06-2008).]