That said, the single best thing about Singapore is that it's a gateway to the rest of SEA. Changi is the best airport in the world, IMO, and you can be in Thailand or Vietnam in an hour for $100. No malls there! (Well not by CapitaMalls, anyway)
I thought YVR (Vancouver) was fast - (You submit your entry form, answer a couple questions on a kiosk, and then present it to an immigration person who makes sure you match the passport - about 2-3 minutes) - but Changi beats it hands down.
Departure is just as good - no long lines at security or worry about missing your flight - everything is done at the departure gate (which also makes a helluva lot more sense from a security perspective as well).
Makes SFO feel like a miserable cast-off of an Airport after spending time in Changi.
That title, albeit very amorphous, is definitely Bangkok's by any honest number (eg. flights) or remotely holistic cultural assessment.