The UA lounge is often very crowded and I actually like the mix of AC and SQ (which are a 5 second walk from each other). Breakfast is crap, but from lunch onwards I have found decent food in each of the lounges, sometimes better than UA.

Maybe something to note: during my last visits, champagne was only available on request at the AC and UA lounges. It’s no longer listed in the drinks menu of the UA lounge and the AC lounge only gets a limited number of bottles each day and does run out occasionally.