Which plane ticket should I buy?

If you can afford it maybe china airline would be best. But if you are not in a hurry go with asiana. 10 hours is not so long. You can always explore the airport and by the time you know it, its already there. Last time I flew I have to stay overnight at airport. Not so bad, air is cool, Stayed in a lounge for more than 8 hours have a nice shower eat a lot. That is because I have waited for about 22 hours til my next flight that is in Hongkong Airport.