I traveled with someone from Malaysia and know people who have visited Thailand and met people from Peru. Never actually visited any of these places myself, although I may check out Peru later this year. They are all very different in many ways…I wouldn’t say one is better than any others. I think you’d have the most buying power in Thailand or Malaysia over Peru, but not sure.
Malaysia is a very Muslim country – it is the official country religion, with over half its population Muslim. Their religion is printed on their ID cards, and they are segregated by religion. Muslim being ‘first class’, Hindu being ‘second class’ I think. The Muslims go to all the best schools, etc.
My friend that went to Thailand also visited Laos and Cambodia I believe in the same summer. You might be able to see both Thailand and Malaysia while in the area, but I always like to focus on a small area and get to know it well rather than rush to “see everything”.
Of course, it might be a lot cheaper to get to Peru than the other two, depending on where you’re starting from. The Peruvian I most recently met said the food in Peru is better than Mexican. I think you have more buying power in central america, excepting Costa Rica. Guatemala, Honduras, Nicaragua all look more affordable than Peru.