For me in
Europe (excluding UK): LH Athens lounge - I find the offering there slightly better even compared to the TK IST lounge (comes in 2nd)
UK: SQ SKL T2 lounge - main reason is because I get some quite good SE Asia food even though I am not heading there, different cuisine from all other *A lounge in Europe/UK with more or less the same offerings
Asia: This is a tough one - but I still put SQ SKL in SIN slightly above the NH lounge, even their First lounge. (Although it seems the new TG lounge seems to be also good, have not tried it). Worst - I would say the OZ lounge even at their hub, ICN. Even Air India have a better edge compared to them especially at a hub.
Australia/NZ: Breakfast offerings - I like the Koru lounges, but other times, the SIN lounges.

On a side note: I do agree that Oneworld airlines, even their Business lounges, do have much better offerings compared to *A most of the time.

Cheers!