Limited experience (maybe 10?). So far I think my favorite is the Sala Miro in Barcelona. The food was only B+ but was plentiful. The drinks (aside from the bubbly) were solid, and there was a *ton* of room. That last part made it excellent.
Sadly, did Dnata in SIN when we should have SATS. I didn't think to check which was better. Dnata was fine, but not special. Experienced both MAD lounges mentioned above recently and thought they were good (also tons of room, but food was meh), but preferred BCN.
Looking forward to the wide variety at ICN when we fly out of there over the next few years.