I haven't done it, but I ask my uber and lyft drivers which they prefer (a lot of people drive both or have tried both), and most say Lyft. I understand Lyft pays better, and you can get tips. I know they also have a car rental program in certain cities; it cuts into your pay, but you don't have to put miles on your own personal vehicle that way (or risk having people barf in your own backseat or whatever). I think the downside is that the times where there is most demand (weekend nights, holidays) and there is the potential for the most money are also the times when most people would rather be doing their own thing and not driving for Uber/Lyft.