Shim,
1. Only your ears and heart will decide that.
2. I believe Korg is as easy in live use, now having the PA800 for a while.
3. Setups are very different, but easy enough in both cases.
4. Third party support (help, styles, etc) - hands down, Yamaha is the clear winner.
zuki
_________________________
Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)