Someplace in town with good dim sum, going to the airport afterwards, and spending less time in the lounges. I'm fond of Lin Heung Kui because it has a very locals/old school flavor when I go there, probably forum regulars have better suggestions.

IMO the dim sum is OK at HKG in the lounges, but just that, OK, a good dim sum/yum cha place has more variety and better quality. I wouldn't go out of my way to get it at the airport unless I was super broke and was trying to save cash (and it's not like good dim sum is super-expensive in Hong Kong).

I realize this violates the unwritten law that FTers must under all circumstances must maximize their experience of all first class lounges and will report to the re-education camps shortly for my thoughtcrime, but that's what I would probably do.