Not everyone will agree, but of the three main brands Leo is probably the tastiest beer in Thailand sold by the Jomtien beach vendors. Some places sell Tiger and/or Corona but these are few and far between.
The newest up and coming beer is Chang Export which has all the taste of Chang Classic without the seemingly chemical additives that are added to their cash cow brand, and which for some people are problematic on the stomach or head the next day.
One thing we can all agree on though is visitors to the beach who know how to enjoy a Thai Somtam or Spicy Pappaya Salad are as close to the real Thai experience as it gets. Ask for no chillies if spicy food isn't for you, but even without it's an acquired taste and one worth getting to know.