Whatever the criteria, no-one could benchmark ATC operations. I'm qualified on only 11 different sectors, they are all different. Still more different when split vertically. How could one benchmark that ?
To benchmark APP, there should be similarities. Where are they ?
EBBR, EBCI, EDDF, EDDK, EGLL, EGKK, EHAM, LFPG, LFPO, LFQQ, EBBR... How can you compare anything ?
Now, MUAC is BY FAR the "most efficient". OK...
How much does it cost ?
Much more, BY FAR !
Is that important ? I don't know.
Anyway, benchmarking is a nonsense.