Cosmopolitiam lives on Long Island.
Advantage NYC 
The food may be good, but otherwise the place is a first grade tourist trap that should be avoided at all costs.
It is frightfully difficult to compare foreign food between countries as everywhere adapts it to the local tastes. If you don’t have that local taste then it is very easy for it to pale in comparison to your expectation of the food.
For exampel an American in London will find the Chinese food not to his taste as he expects US-style Chinese food but instead got UK-style. The same couly work vice-versa. Thsu from only one viewpoint it is hard to say which is better or worse as your viewpoint will always be skewed.
<insert hilarious joke about crap British food here>
Havign said that, the Chinese food here in Sweden is seriously shit.
In my experience Chinese food everywhere normally bears very little resemblence to Chinese food in China (where they obviously just call is food :)). This isn’t just limited to Chinese though, it also applies to Mexican, Indian and virtually every other cuisine.
“Foreign” cuisine is almost always adapted to the local taste. Sometimes these changes are fairly minor, sometimes they result in a complete travesty of a dish such as deep pan pizza (everywhere) or a caesar salad with a damn poached egg on top of it (Adelaide)
I think defining a city as most cosmopoliton based in the cuisine available is a tenuous link at best.
Oh for sure it’s the most cosmopolitan town on earth. And sure, NYC isn’t that far behind but please . . . Sydney ? Paris ? Not even within shouting distance, and won’t be for 100 years – Paris isn’t even a big town, for goodness sake.
All you need is to spend a single day here - away from the tourist trail - to know what it’s really like.
There are a lot of reasons why it’s so; 300 years of empire, colonies and Commonwealth and all the ties that generates, the proximity to Europe, the English language itself (being the international language) attracts – surprisingly enough – students from all over, esp. those who can get here much more cheaply than they can across the Atlantic, the cheapest and busiest International airline set up anywhere, the traditional starting point for ‘doing Europe’, the European HQ of choice
home of choice for Non-European international companies looking to break into Europe, the huge banking/Finance sector which brings in people from all four corners . .
What all of that means is that there are huge concentric circles of ex-pat infrastructure here; tens of thousands of Aussies have landed on one day and started work the next – why ? because their parents/uncles/sisters who benefited from that infrastructure told ‘me how it’s done. Multiply that across just about every nation on the planet. They’re all here, and they’ve been here for hundreds of years. Newspapers, mags, designated pubs – I was in the pub that London Fijian Lawyers seemingly use as their HQ just the other night – it’s endless.