I have done comparison drives twice. Once I took a cab from SOMA to Pac heights: $8.35, Uber back to the same spot: $15.95
SOMA to Dolores Park. Cab: 7.90. Uber: 15.25
Clearly not 10%. I guess the big thing for me is that I really don't care about bottles of water or the type of car the person shows up in. I just want an on demand service that gets everything done in a sensible way. If there was a cheaper version of Uber for regular cabs I would be all over it.
The bigger picture though is how much people will fight to keep crappy businesses in business. We will hear the argument about how we cant lose jobs right now when unemployment is so high, but for the love of god, this is progress people. If some cab drivers lose their jobs in the name of progress is this really worth hurting society over?