The more important difference is that Waymo's FSD system is SAE level 4. The Tesla FSD system that is in their cars that people can currently buy is level 2.
The difference is that the former only needs human help in rare circumstances. The latter needs human help in common circumstances.
If you base you robot taxi on a level 4 system you just need humans on standby to respond when the car knows it needs help and asks for it. If you base it on a level 2 system you need humans monitoring during routine trips to be ready to intervene when the car is about to do something stupid and has no idea that it is out of its league.
The difference is that the former only needs human help in rare circumstances. The latter needs human help in common circumstances.
If you base you robot taxi on a level 4 system you just need humans on standby to respond when the car knows it needs help and asks for it. If you base it on a level 2 system you need humans monitoring during routine trips to be ready to intervene when the car is about to do something stupid and has no idea that it is out of its league.