Cantonese is still dominant in Hong Kong, but Mandarin has long since taken over in Singapore in all official contexts and, increasingly, in the private sphere

Cantonese is still dominant in Hong Kong, but Mandarin has long since taken over in Singapore in all official contexts and, increasingly, in the private sphere as well. Unlike comparatively homogenous HK, Singaporeans speak a whole slew of dialects (Hokkien/Minnan, Teochew, Hakka, Cantonese, etc) and Mandarin also serves as a unifying factor.