I bounce between Lyft and Uber. If I'm feeling social, I'll check Lyft. If I want to answer emails on my phone without feeling like a dick, I use Uber. Surging pricing also influences which one I choose.
That said, transportation is a utility for me and I'd prefer not to pay a higher price for a slightly better ride. @ryanlawlershared more details here.
Similar response to @rrhoover. I much prefer Lyft's default-friendly to uber's default-silence. (Though both will switch if asked). I don't like Uber's anti-competitive tactics of late, so I avoid them when I can. But there are occasions when Lyft's on surge pricing and Uber's not, in which case I'll use them. I slightly prefer Uber's multiple card support.
As far as SUV service: I'd use it when you know you need more space for people and/or bags.
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Lyft is a transportation-based community, while Uber positions itself as a utility for busy professionals. Quality control is generally tighter on Uber (in SF), and the drivers are really intriguing people. That said, Uber as a company is unscrupulous and stumbles from one PR disaster to another because of their greed and arrogance.
I prefer Uber, because in Lyft I feel like I'm being evaluated, even though I'm the client. e.g. some Lyft drivers complain about passengers they've had that haven't talked to them much.
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