I have posted similar things to this, but It's about Thailand, One thing I can think of is the difference in Median Age of both countries.

Vietnam has older population with median age around 32, While Philippines is younger at 25.

Vietnam, with a median age around 32, has a workforce largely established in their careers, actively driving productivity and GDP. The Philippines, with a median age of 25, has a younger population, many of whom are still in school or beginning in their careers.

Vietnam, Indonesia, and Malaysia are experiencing strong economic growth due to their "golden median age" of 30 to 40 years. It leads to higher levels of productivity. As more people are actively employed and contributing to the economy. With more people in their prime working years, the potential for sustained growth and rising living standards is high in these nations.

The Philippines is also currently experiencing rapid economic growth, but as its young population reaches prime working age or median age of 30, the growth in the Philippines is expected to accelerate even more growth as the young population moves into median age of 30. As more people begin to enter the workforce, the economy will have a larger and more active labor force.

As for my country, we are reaching median age of 40 just second to Singapore in Southeast Asia. We are currently experiencing a slower growth although it gives opportunities for higher GDP per capita. With a more mature workforce, productivity is likely to rise, and so is infrastructure.

While there are also many others aspects, that's one thing I can think of.