KA lounge is indeed very good. I like the noodle bar in both KA and CX lounges.

KA lounge has only four internet stations. I tried use PCCW WiFi but it does not work too well for me. The Cathay WiFi seems to work better. Also I would normally do some work in the lounge. CX lounge has a lot of desks that I can use.

As far as just relaxing and having a snack or a meal, there is actually little difference between the lounges. I prefer CX because of work.