Random guess: most of the pople I know who use Lyft do so because they've been put off at one point or another by one or more of Uber's scandals - Uber is widely viewed as the 'default', while Lyft is the more 'moral' option. If this pattern holds true, it means that the Lyft userbase will generally be a group that is A. better informed overall and B. more willing to make purchasing decisions driven by their ethics, which all in all suggests a more thoughtful clientele.

Lyft's fare is predictable, and rises little even at peak hours. The fares are mostly in the same ballpark as Uber's.

Lyft's Android app just works, and is reasonably usable. I've been burned by Uber's app crashing after an update.

I keep using Lyft over Uber; most drivers I see in my area (NYC and Brooklyn) have both apps installed. But many seem to have the Lyft-specific sign under the windhshield, but rarely an explicit Uber sign.

As a corporation, Lyft seems to be much less showy, and does not seem to be losing gargantuan sums on pie-in-the-sky projects. They project a nicer, if understated, image; this is also somehow attractive, and likely says something about the way the company is run.

Lyft charged its riders more, and didn't have all kinds of crazy specials like "Pay $25 for ten rides" kinds of things.

My guess is that people who could pay more for Lyft did. I gave a lot of homeless people rides through Uber, but never through Lyft.