Also, if you want to study abroad, the environment in Thailand will be relatively better. Thailand's economic development is better than Vietnam's, and its leisure living environment is better. If you go to Vietnam, the conditions are relatively poor. Go to Thailand if you want to enjoy it, but you will become a master after suffering. Come back and find a good job.
There is also a political aspect. Vietnam and China are now in conflict with the South China Sea, so the Vietnamese have some anti-China sentiments; However, there is also political turmoil in Thailand. Because Thailand's military forces are not integrated with the government, there are often two contradictions and riots. Many times, tanks and armored vehicles like the capitals of big cities take to the streets and stand in front of the government. Therefore, the security risk is relatively high. Political turmoil and financial crisis can be said to be the recent stagnation of Thailand's economy. Therefore, the government relaxed travel restrictions and made great efforts to travel to Thailand without a visa.
These are personal suggestions.