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 Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO