Cyberpunk 2077 Getting to Delamain's Core in "Don't Lose Your Mind"
Personally I'm holding out for the Intelligence ending, where you combine all of the AI into one.
The first option of destroying the Core does what the video shows, you get the Car, and the Excelsior personality while driving it.
If you do the second options, which is pressing the button. You get the Car but no personality, but Delamain will still chat with you from time to time.
Finally if you do the intelligence route with 10 points in it, you will combine all of the minds into one AI, and you'll get the Car with a more "free" Delamain.