Which are the top 3 countries I should visit in South East Asia or ASEAN?

Each country is beautiful, very different and has its own uniqueness. English is widely spoken in Singapore, the Philippines and Malaysia as such, navigating around these countries with English is easy. Tourism is big in ASEAN or South East Asia; hence, English is still understood in countries such as Thailand, Indonesia, Cambodia, Vietnam, etc, especially in the hospitality sector. Singapore is one of the world's most popular destinations as most airlines would fly into Singapore. It is a modern country with beautiful attractions. If one is into the outdoors, nature and beach holidays, then Malaysia, Thailand, Indonesia would be ideal countries to go to for their natural mountains and also islands.