Part time I went to Paris I had a 30 minute wait for a taxi at Gare du Nord.
However last time I was as Dulles I wanted straight into a taxi, having been burnt the previous time when I ordered uber while going through customs and had to wait for ages.
At Singapore Changi taxi queues can take ages, or no time at all.
In Kenya I waited for an uber for 40 minutes to have it cancelled by the driver as I saw him get close to the airport, with a message saying he had “been arrested”.
I don’t bother with uber in the U.K. any more - very rarely works. Used to be nice and reliable in cities It was in, about 10 years ago.
You can’t draw a conclusion based on personal annecdotes.