I own both 2017 model x 75D and 2020 X7 M50i. I couldn't careless about autopilot on model x (I've used it many times and it's still unreliable) so I didnt get driving assistance on x7. To be honest, the performance is very close between the two but if I really want to get model x straightline performance on m50i, i need to stay in sport mode and the mpg drops to single digit.
