well ... there's Guam. That's different.

Then there are CLE, MCO, and LAS which probably have a different feel but you're committing to outstation 737 flying forever. I would advise against picking one of those small bases if you are agnostic about where to live.

Among the CONUS hub bases, the more frequently discussed difference is WB vs NB. The cliche is true - it's a different airline. Even if you yourself say you never, ever, evereverever want to fly WB .... your fellow pilots do. The more WB options a base has, the less competition you have for good NB flying. So to that extent, SFO and EWR are the winners.