And here's the problem with anecdata: Most people I know use both, or Uber exclusively. This is also in Seattle.

Uber is doing 10x more revenue and 20x more bookings(last time I saw stats, which was 1-2 years ago)

I think it's relatively uncontroversial that Uber is substantially larger than Lyft in most or all markets. But Lyft also appears to be maintaining its share and even growing it in many markets, where many left it for dead.