In the case of Singapore vs. London (implicitly including the governing structure of Britain since London isn't a city state)? A few I can think of straight away:

Democratic decision making. Therapeutic rather than punitive law enforcement. Lenient punishment of crime. Absence of censorship.

Naturally all of these aren't fully realized in London either. Britian dosen't have real free speech, yet it has much more of it than Singapore. Britain has (in my opinion) silly and draconian anti-drug laws, but it dosen't execute people for smuggling drugs. London doesn't have corporal or capital punishment. The parties in Britain are mostly the same class of people, yet at least Cerberus (Lib/Lab/Con) has three heads, you get to vote the one that promises to gnaw at you the least, Singapore is democratic in form only, and it is a very transparent cover. Only one party has a chance of victory, and it has been that way and will remain that way for some time.

Yet despite all these infractions against stated Western ideals, life isn't measurably massively worse in Singapore than in London. And Singapore seems to work better as a multi-ethnic society than London. The world is globalizing, de facto multiculturalism is the destined future of every city from Vladivostok to Santiago so the Davos men tell us. No place like Norway or Japan in our future, but elections where we will see ethnic blocks and identity politics. I don't know about you but I prefer Lee Kuan Yew to that mess of tribal politics. Which city would deal better with a riot? Actually which city is more likely to have a riot? Recall what Lee said in his autobiography and interviews he learned from the 1960s riots. Did it work? It sure looks like it did. Also recall from what Singapore started, and where surrounding Malaysia from which it diverged is today. What is the better model to pull the global south out of poverty? What is the better model to have the worlds people live side by side? Which place will likely be safer, more liveable and more prosperous in 20 years time?

It seems in my eyes that Singapore is clearly winning in such a comparison. Yet clearly it does so precisely by ignoring several universalist ideals. Strangely they didn't seem to have needed to give up iPods and other marvels of modern technology to do it either.