Battle of the Transit Systems 4: Chicagoland vs. San Francisco-Oakland/Bay Area vs. Greater Boston (best, rates)

[Rwarky]

This is the fourth battle of the transit systems installment consisting of the following areas:

-Chicagoland, IL
-San Francisco-Oakland/Bay Area, CA
-Greater Boston, MA

Out of three areas listed above, which metropolitan region is the most user-friendly, is most reliable and on time, most extensive in its reach to both cities and suburban areas, operates the longest time on a daily and nightly basis, and overall, the best of the three areas public transportation systems?

[atlantagreg30127]

The topic of "best transit system" has been done multiple times in various incarnations. Rather than re-created new ones for an infinite number of combinations of cities, please find one of the generic "best of" topics on it and post/add to that one. Thank you.