Probably that's better if the main purpose is to showcase himself in NA, but for a purely development point of view I have no doubt that staying in Davos and playing against grown ups in a good level tournament is much better.
For someone that already played 80/90 matches against full grown men, going back to CHL is probably a step back
For someone that already played 80/90 matches against full grown men, going back to CHL is probably a step back