A good indicator is that most cab drivers (at least in SF) have switched over to Uber. The only ones who aren't doing Uber either (a) got low reviews on Uber and kicked off the platform or (b) have some odd loyalty to cab companies (e.g. maybe they're a part owner in a medallion).
Most taxi cab drivers are treated more poorly than Uber/Lyft drivers. They have to drive to a centralized location to pick up / drop off the car, don't have their own car to take care of, have to pay a per day fee that they don't always pay back if they don't get enough business, etc.