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For population use, there are no barometers so long as the United States, Canadian, or United Nations recognize that population is acceptable within any of their current definitions.
All three are global cities, to which extent? By that, which one is most, which one is least, and which one coasts through the middle overall?
For some criteria, you may cite plausible studies or you may choose to make your own arguments, albeit they must be supported with some backbone of facts. Some factors for your consideration could be within GDP, PPP (purchasing power parity), global influence, cultural influence, prominent industries, global link, collaborations with businesses offshores, so on. Be creative about it.
I'll leave the poll as multiple choice for those of you that may think it's a close call or that it could go any which way between multiple cities (or all for that matter). As for myself, I roughly consider them the same tier globally, so personally I'll be voting in all three.
These comparisons are tough (albeit fun). It's all about preference. At least with these cities, they all have infrastructure similarities. Toronto and DC win with public transportation. San Francisco wins with weather and natural setting. DC wins with culture and architecture. Toronto wins with diversity (and quite possibly cuisine). DC wins with global respect (but Toronto and SF are in the same "tier").
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