Interesting angle. My experience (in NYC) has been that while taxis most certainly have better knowledge of the city, Uber is by far more reliable in just getting me there. This is because of the key difference of Uber knowing exactly where I'm going in advance, and relaying turn-by-turn directions to the driver. Most of the time, the taxi driver knows the address or cross streets I'm going to. But when they don't, it's painful. I've never even been asked in a Lyft/Uber, though.