Cruise does distinguish itself by driving mostly on busy downtown SF streets, a challenging environment, and they've released impressive videos showing off their capabilities.
A few weeks ago Kyle Vogt claimed Cruise would surpass Waymo 'in a few months', whether they do or not remains to be seen, but they are making sustained progress and they have the full force of General Motors behind them.
Unlike Waymo, Tesla's Autopilot program, and Uber's autonomous driving program, Cruise's operation has been drama free, without any lawsuits, leadership blowouts, or departures of key people. This implies they've got a solid team under good leadership, and I think it matters a lot with complex software projects like this.