You conveniently jump to Bangkok than back to HK and S*pore in the same conversation...
Singapore is already a huge success story, and supposed to stay around the top of the World in the near future. HK has bigger political trouble but everybody and their goat already know it is more dynamic than Spain. Again, with your budget in HK the issue is not only the noise of your neighbour's toilet, but also managing to live in a place that looks better than a run down toilet.
You sound like you will happy with your kids going to a HK or S'pore public school. Thailand is very different, the population is largely uneducated and public education has a very poor reputation. Schools in Asia preparing for International Baccalaureate will usually adopt the same biases you noticed in Spain, although there are probably exceptions (there are exceptions where I live - we didn't go for those, but you might. Exceptions still often cost over 30kusd a year per mini Musk, increasing each year )
You might have needed months in Spain to figure out a bidet is not a European urinal but you definitely found out earlier Asia is expected to growth faster than Europe in the next decades, minting way more multimillionaires along the way. No idea how you ended up considering Spain in the first place, it's not like it is considered the technological hub of Europe or a particularly dynamic country in that continent.
Besides Spain has developed exceptionally from Franco's death in 1975 to 2008, it was the miracle story of Europe for a while. Much of it probably came from joining the EU, and not many are expecting it grows that fast again anytime soon, just thought I'd mention it, older folks in Spain have often know very miserable conditions, much worse than now. Living conditions in Spain have improved greatly over the last few decades.
Besides thanks for the feedback about the noise, I hate hearing the neighbors although again if the solution for a detached house is moving too far from the school, I'll probably still go for a semi detached or a atico. To put this in perspective again, I live in a semi detached house in a very posh residence (could buy a huge property in the poshest suburb of Madrid for the price of the house I live in here, although I rent and rental prices are actually decent), you can't hear the neighbors when they pee or talk or watch TV. Yet there are always major renovations in a house nearby, everybody now seem to want a cellar or underground parking apparently, which weren't dug initially) and the construction noise is often unbearable - that's perched on a hill, out of the public roads, people living nearer traffic also have to deal most of the time with public renovations and construction sites - developing Asia has been moving fast, too fast to get proper infrastructure, and much of it need to be updated/completely redone after a decade or 3. Very noisy.