I'd rather take care of the tip right away (or as soon as I have a chance) than have to remember to do it well after the fact, but in either case I'd much prefer to not have to remember it at all and just be done with the whole thing the second I step out the car. (There's also the rating thing with both Uber and Lyft, but at least that's faster and I wouldn't really feel bad if I were to forget about it.)

That, and as I sort of implied earlier the honesty/inclusiveness of the fare estimates is a concern, in that whereas a $10 estimate in Uber means exactly what it says with Lyft I have to remember to do some additional math on top of that.

(These probably sound like the epitome of "first world problems"; I'm not saying that Lyft isn't good, or even that it's dramatically worse than Uber for me — just that their competitive landscape is such that even minor usability issues like these are currently costing them my business.)