United Arab Emirates vs Singapore

DXB and Changi are the two busiest international transit airports outside Europe. For travellers on long-haul routes between Europe/Asia and Australia/Africa, both are common 6–24 hour layovers — and both reward layover passengers with city access via excellent metro systems.

For the layover use case, the choice is rarely either/or — you might land at one and depart from the other. But the comparison matters for business travellers picking which to stay overnight in, and for tourists who can only choose one Gulf or Southeast Asian transit destination.