T3 lounges in personal order of preference
1 VS clubhouse - Alex's tip is a good one
2 SQ F Lounge
3 The London lounge (AC/SK)
4 SQ C Lounge
5 AA Flagship lounge
6 Admirals club
7 UA RCC
Never been in the UA First lounge.
The saving grace of the FL is the availability of halfway drinkable champagne. And it's arguably the best AA lounge in the network - says a lot for the rest.