Manila is 9.1% larger than Muntinlupa.
Area: 42 km2 calculated
Manila is the capital and second largest city of the Philippines. It is one of the sixteen cities which, along with the municipality of Pateros, make up Metro Manila, the National Capital Region, whose overall population is around 12 million. Wikipedia
Area: 39 km2 calculated
Muntinlupa, officially the City of Muntinlupa, is the southernmost city in Philippine National Capital Region. Wikipedia