Taguig is 6.3 times larger than San Juan, Metro Manila.
Area: 6 km2 calculated
San Juan is a city in the Philippines. It is one of the cities that comprises Metro Manila, the National Capital Region of the Philippines. It is the smallest city in the country in terms of land area. Wikipedia
Area: 37 km2 calculated
Taguig, officially the City of Taguig, is a highly urbanized city located in south-eastern portion of Metro Manila in the Philippines. From a thriving fishing community along the shores of Laguna de Bay, it is now an important residential, commercial and industrial center. Wikipedia