All these surveys are sketchy. Methodology is all over the map, and in some cases influenced by marketing. However, if you keep all that in mind, summary here:

https://en.wikipedia.org/wiki/City_quality_of_life_indices

Wikipedia also has some data about immigration to Singapore

https://en.wikipedia.org/wiki/Immigration_to_Singapore

My dad was a demographer. There’s lots of demographic data, but it’s really hard to analyze. Migration is influenced as much (in many cases more) by policy than by personal preference.