You can't use political borders in this way. You're trying to make an argument about population differences between cities and their suburbs, but every city defines these borders differently (to sometimes include almost all of their "suburbs", sometimes none, and everything else in between).
The key to recognizing how absurd this is: your argument would have to drastically change if each city moved its political borders +/- 15 miles in either direction, but nothing on the ground would actually be any different (that is, there wouldn't suddenly be more people living in one kind of environment and fewer in the other, although, definitionally, that would appear to be the case).
These lines are politically drawn. They don't support arguments of the kind you're making.
Why does San Antonio have a much larger share of its metro's population than does San Francisco? Because the borders of San Antonio extend to cover ~465 square miles to San Francisco's ~44. What does that tell us about these two cities? Basically nothing. (In fact, this information directly misleads us into thinking all sorts of things that aren't true (for example, that San Antonio might be bigger than San Francisco).
The key to recognizing how absurd this is: your argument would have to drastically change if each city moved its political borders +/- 15 miles in either direction, but nothing on the ground would actually be any different (that is, there wouldn't suddenly be more people living in one kind of environment and fewer in the other, although, definitionally, that would appear to be the case).
These lines are politically drawn. They don't support arguments of the kind you're making.
Why does San Antonio have a much larger share of its metro's population than does San Francisco? Because the borders of San Antonio extend to cover ~465 square miles to San Francisco's ~44. What does that tell us about these two cities? Basically nothing. (In fact, this information directly misleads us into thinking all sorts of things that aren't true (for example, that San Antonio might be bigger than San Francisco).