As a DM, I'd personally stick with KE. I flew them about 2 months ago (economy) from NRT-ICN-HKG, but because of status did get an op up NRT-ICN on the 773. I was not upset.

The lounge is quite frankly wonderful. That alone would make me stay in SkyTeam. Inflight service was excellent. I have not flown Asiana, just voting off of real and possible perks for you.

Also, agree on temps on at least KE. was a bit warm and no vents overhead.