Singapore has the best terminal ever, IMO. In the long haul international arrivals terminal, they actually had a person stationed in the restrooms who IMMEDIATELY cleaned the stall after an exit. So darn clean I'm pretty sure you could have eaten off the floor.
Other than that, I'm with the PP who said "my favorite airport is the one taking me on vacation."
Other than that, I'm with the PP who said "my favorite airport is the one taking me on vacation."