For just one thing - the Tesla app is better than the iX app for me - the internal temperature of the car.
When I open the Tesla app I can check how hot it is inside the car - 10 minutes before I intend to get in the car and take a drive.
Bearing in mind that I live in a hot country - this is a priceless function for me.
The other day - I parked car for 20 minutes in middle of the day and it was outside in the sun.
Just before I left my meeting - I checked on the app and saw that the inside of my Tesla Model 3 was 62 degrees C (144 degrees F!)
10 minutes of pre-cooling before I got back to the car saved me from a sweaty journey back home!
I wish the iX showed me the inside cabin temperature on the app - hopefully this will come in future software updates.