I have not taken a taxi or Uber for years but had to take 3 in the last few months. First a ten minute ride for £6 (UK) felt like what I'd have expected to pay a taxi 20 years ago.
Then a 35 minute ride in traffic for £11 feels like it should break some minimum wages laws after overheads are considered.
Finally a 70 minute ride for 6 through city traffic costing £45. At which point it's on par with public transport costs (trains).
I just use my local firm.
For all their faults, Uber/Lyft/etc. did make hailing a ride using your phone a much better experience than cabs in many cities. Not for everything; I still use a car service for airport rides.
Sometimes. If you know the price it's obviously easy to compare. I do happen to know taxi prices from a few airports to central areas and Uber used to always be cheaper. Significantly cheaper years ago. Today it's a crap shoot and the taxi's are often faster since you don't have to wait. If the taxi is no more than 5$ more expensive then I take the taxi. I'd say it's about 50-50. Sometimes the Uber is a good deal ($10 or so) cheaper.