Safety
Sorry, but the safety record of Asiana leaves a lot to be desired. It's not only the "famous" B777 tragedy at SFO, but the A320 crashing at HIJ, the A330 taking off from FUK without ATC clearance, the A321 tail strike at ICN attributed to pilot error and the A321 runway overrun at IBR. Then you have the fact you're using ICN where landing aircraft have come under military fire (OZ324 on 17/06/2011), and the sad fate of OZ991 which caught fire and ended up in the sea, still under investigation. And all of this in the past 7 or 8 years.
Thanks, but I'd choose BR every time. Excellent safety record, fine service and nowhere near the Korean border.