Pros: Some beautiful parks and nature spots. Very walkable (and cyclable, with a couple of omnipresent bike share systems and an extensive running / cycle path network). English is the defacto language spoken by everybody. Virtually no crime or homelessness. Infrastructure is top notch. The government are competent, pro-active, and non-corrupt. Condos all have great facilities – multiple swimming pools, barbecue pits, and a gym are the norm, tennis courts and steam rooms are common. Diverse culture that’s a combination of Malay, Chinese, and Western, with major holidays celebrated throughout the year. Amazing, cheap food from many different cultures. Loads of fantastic travel destinations on the doorstep. Excellent education and support for families. Very low taxes.
Double-edged sword: A humid 30°C year-round with no winter – some people love it, some people hate it. Draconian drug laws – people are executed for bringing drugs into the country, even weed, but Singapore is clearly avoiding a lot of drug deaths and related crime and social issues.
Cons: High cost of living. Long-term visas can be tricky; permanent residence and citizenship are getting very difficult these days. A lot of economic inequality, with an extremely low-paid immigrant workforce. The government is socially conservative but pulled a little further that way by the pioneer generation, so illiberal laws when it comes to freedom of expression, gay rights, etc. It’s a small place, so if you are always looking for new things to do, you’ll have to travel.