I used Uber a few times last year in Paris. Overall I had a very good experience.
One advantage of Uber is that I don't need cash. The other is that the driver takes a computer set path vs taxi drivers that many times get lost (on purpose or not who knows).
Keep in mind that you must have cell connection if you want to track the arrival of the car.
I did not have cell connection and relied on wifi when ordering the car but then sometimes could not see that the car is delayed.