Thailand has similar neighbors in not just Burma, but also Laos, Malaysia, Cambodia (all which border Thailand) and Vietnam and Indonesia, which don’t quite border Thailand. Let’s throw in the Philippines, too, for good measure.
Laos was ceded to the French by Thailand in a move to avoid French colonisation. The adjacent part of Thailand is the poorest and most drought stricken part of Thailand, so maybe the Thais got the better deal there. Laos is still a poor country and went through some tough times during the Communist insurgency in neighboring Vietnam.
Burma was colonised by the Brits, as previously noted, and in a more perfect world would get a lot more attention for their crazy military junta, which for some reason is just not as trendy as North Korea’s Sun Jung Il these days. Maybe if they develop a nuclear capability we’ll here more about them.
Vietnam seems to be a fairly stable and dynamic country these days. Not sure how much of that is attributable to the changing climate in China, but no one can argue that it was a tough place from WWII to at least 1975.
Malaysia is seen as a fairly decent model of a moderate, democractic state, despite their history with the British. There are some Muslim insurgency groups there, but they seem to focus their efforts on destabilizing the southern parts of Thailand which have a higher than average sized Muslim population.
Indonesia was a Dutch colony and also went through some nasty dictatorships and social upheavals. They seem to be leaning a bit more towards democracy these days but there is still a lot of relgious and ethnic tension directed towards minority (see: E. Timor) groups.
The Philippines was fairly stable through most of the 20th century, maybe owing ot the relatively early departure of the Spanish, but then they inherited a lopsided relationship with the USA. DiMarco kept the country stable but poor. The people power revolutions that followed have not done much to eradicate some of the systemic poverty in the country, but this might be as much about their diffuse geography as anything else. I’ve not heard much about the Muslim rebels in their south lately, but that’s likely as much about bigger headlines as anything else.
Thailand has been a relatively stable country, but hardly a force or beacon in wilderness to these other countries. They seem to have established a balance between corrupt democracy and military rule over the past several decaces, maybe aided by the country’s respect for their King who has now been on the throne for 60 years. He has no actual constitutional powers yet exerts a very strong influence on the country’s politics.