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It isn't something you'll find out from crash tests. It's easy to make vision based automatic braking work perfectly in highly controlled test conditions. Making it work properly on the road is a whole other matter.

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I've got a vision-only model Y. I don't know how good the radar-based ones are, but I do know the vision-based adaptive cruise isn't great. Does a fairly poor job of maintaining a consistent distance to the car ahead, compared to other cars I've driven. I also had to turn the automatic emergency braking to its minimum sensitivity setting after it slammed on the brakes a couple times for no reason.

So I don't know if the radar-based was better, but the vision-based isn't very good imo. (FWIW the vehicle's been great otherwise.)

They turned my radar off when I got the FSD beta. It's hard to tell what is from losing radar versus getting FSD itself, but I think I liked the radar better. It seemed to perform better and have less phantom braking.

Agreed on the adaptive cruise. Glad to know there is a braking sensitivity. It gets very jumpy about oncoming traffic on curves and hits the brakes for no reason. The cars following me loved when it did that twice in ten minutes.

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