Singha Beer is the Thai Beer, but I never drink it, and Lord knows why they decided to launch a Singha Light. Leo has it's fans, some say it tastes "hoppy", like a German beer. I disagree. Tiger Beer is not bad, Heineken is certainly drinkable and gives a less severe hangover than Chang. You see, there's plenty of choice, but most of it might as well be thrown straight down the bog, cutting out the middle man.
This blog has some interesting analysis of beer in this part of the world:
(if you somehow found this post, it's very old (2006)) I still like Chang though!