I can get an Uber any time of the day or night to take me where I want to go. An Uber shows up within 5 minutes - always. If I call the taxi company for a cab, one may or may not show up between 45 minutes and an hour - if one shows up at all. Uber drivers are held accountable for the condition of their cars, their appearance, their personality. Taxi drivers stink, are rude and their cars are always a mess. I would never use a taxi. I always use uber.
Better yet, for the world traveler, Uber works in pretty much all major cities, tied to the same account. No messing around with local vs foreigner rates, tipping, blah blah blah. Just get in and GO. Then get OUT when you arrive. I HATE arguing with cabbies over fares, rates etc etc. it's absurd. Uber gets rid of all that and gives me a simple interface and one point of billing. If Uber was forced out of my city, I'd go buy a car rather than use Taxis.