Metropolis would probably be like Tokyo. Very safe, clean and futuristic.
Gotham would be Hong Kong because it's a little grittier and with higher crime but still so beautiful. I can definitely imagine batman wanting to fight for a city like Hong Kong.
Wonder Woman would probably live in South Korea, correct me if I'm wrong but I think they've currently got a woman prime minister and I think she would love that.
Aquaman would be Samoan because I like what Jason momoa said about them worshipping the water and it's a little more segregated from the rest of the Asian area like Atlantis is from the main DC universe I reckon.
Anyway that's what I think