I've been in licenced taxis that were clean and driven very well, I've been in licenced taxis that were filthy and driven appallingly.
I've been in Uber that were clean and driven very well, I've not yet been in one that was either dirty or badly driven.
So far.
Currently seems most Uber drivers are uber-happy to have a job and will do anything to keep it - whilst perhaps some taxi drivers have been doing it for 20+ years and frankly aren't that bothered any more (which is understandable)?