For the most part airport lounges are comfortable places to wait before a flight, to relax and make travel a bit less stressful. The very best make travel truly effortless by escorting you from the moment you enter the airport until the moment you leave. When you never even know what gate you’re leaving from — as with the Lufthansa First Class Terminal and Air France La Premiere lounge — that’s truly the top level of ground service. It’s someone else’s job to worry about that for you.
I’m not going to make claims about the rank order of 1, 2, 3, etc. We can have great discussions about what makes for the ‘best’ lounge — whether it is spaciousness, personal attention, food, a spa or a car service from lounge to plane. Instead I will offer four ‘groupings’ that total 10 lounges. I’m not making a rank-order claim within each grouping.