In my experience it seems that the price floor is higher, but the ceiling is lower. Short rides (~10 min) that might cost 8-9$ (before tip) on Uber / Lyft, cost $18-20 on Waymo. If I'm going to the other side of San Francisco (say, North Beach to Stonestown), it will be $33-35. I've never seen it in the $40s-50s as I often do with Uber / Lyft for long distance trips during surge pricing. But that's just anecdotal.