you are comparing Apples and Steak. Both are incredible, and have little in common other than the fact they will startle tourists from Tennessee with mixed drinks that cost over $12.
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London
advantage over NYC:
-much better beer (top-notch real-Ale and various European brews)
-better international travel opportunities:Paris and Brussels are both 2hr direct train rides away.
-slightly milder winters
-richer and longer history:Tower of London, St. Paul's, Westminster, need I say more?
-stronger Arab and Indian presence (if that is your thing), including their food.
-if you are from Europe London will be closer to family and friends
-much stronger soccer (football) culture.
NYC
advantage over London:
-Since most of us are Americans being in a city in our own country is it's own advantage.
-More sunshine (unless you are in Manhattan).
-more convenient taxi system.
-much stronger Latino presence (if that is your thing)
-better cuisine (although London is catching up)
-much better skylin
-more options if you're into U.S. pro or college sports.
Other points: Both cities have excellent public transportation. Both could use some infrastructure improvement but I think the subway needs it more than the Tube (London Underground). NY subway is longer and reaches more stations than the Tube but is dirtier and less user-friendly. The tube's lines are easily understood (aside from the Circle, and Hammersmith lines of course) unlike the subway's bewildering express trains and its mix of lines being named for numbers and letters. Also, I assume NY has something similar but in London you can conveniently get on the Piccadilly Line from Heathrow airport and be in central London in 45 min without getting out of your seat.
NYC will kill you with tolls but Central London has a congestion charge during busy times. Pick your poison here...
I don't know which city has more green-space but they differ in layout. NYC has the huge Central Park
but London has multiple good-size parks like Hyde Park and Regent's Park. Both cities have an annoying amount of upper-class poodle carrying. Both cities are extremely important to global finance.
Seriously, google NYC vs London-this topic is of interest to many others. I'd choose London but I may be more inclined to live abroad than most others.
Read more: http://www.city-data.com/forum/city-vs-city/606043-london-vs-new-york-living-cost.html#ixzz2wUKtMRJg