I used to slightly prefer Lyft but now greatly prefer Uber. In the beginning, Lyft only drivers were generally a bit more personable and Lyft Line passengers were generally always outside waiting and happy about sharing a ride.

I've mostly been taking Uber recently due to their low prices. However, last month Lyft had a Line promotion and I got to take about 60 rides. The vast majority of the drivers were clearly fired Uber drivers and the experience was way worse. Dirty cars, unable to follow navigation, bad driving, no English, and one driver was just a straight up weirdo. They are clearly passing anyone at the in person interview now. And they all had high ratings of 4.7-4.9. I've had similar bad experiences on Uber but they are much less frequent and the drivers were almost always rated 4.3-4.6.