It’s hard to put my finger on any specific thing, and it may even come down to the fact that I see a lot more Waymos than Cruises, and have also seen Waymos around SF for much longer (or at least noticed them for longer).
I feel like Cruises are a bit more cautious, to the point of making me skeptical. But again, I’m struggling to think of any example in particular.
This might be silly but I also think the Cruise cars are much more ugly.