Does it only have value when it agrees with your fairly narrow view of the world (if it's not London it's rubbish?). Like does architecture only have merit when it's hundreds of years old? Lloyd Wright, le Corbusier, Gehry, Rennie Macintosh have no place in your world?
No, you're missing my point; London has a far greater depth of architectural history than New York, so to place NY above London on such terms is daft. London has far greater variety and diversity of styles, throughout the city, whereas most of NY's outstanding architecture is concentrated in or near Manhattan. And yes, I have bin there.
I appreciate the work of those architects you've mentioned. They do fit into a relatively narrow historical period mind.
Whereas with London:
The Romans, the Anglo-Saxons, The Normans, The Tudors, Christopher Wren, Nicholas Hawksmore, The Victorians, The Brunels, John Nash, Pugin, The Gilbert Scotts, Charles Holden, Denys Lasdun, Norman Foster, Richard Rogers, Zaha Hadid and even our very own aP off here, to name just a few, if yer really wanna start name-dropping....