It's a hell of a lot cleaner than New York, significantly better air quality, and a lot less traffic. Food is similar, although New York has greater selection. Singapore's European cuisine is on par with nearly every New York option outside a very small handful. Singapore is definitely hot - but so is every place in SE Asia. At least it isn't miserably cold like NY in February. Rainy season in Singapore is a bit more bearable.
Singapore wins hands down with airports, public transportation, air quality, and traffic. People tend to be a bit friendlier on average in Singapore - but that's variable. Stereotyping - Singaporeans are very organized, educated, and articulate. The same can't be said for a significant portion of New Yorkers.