The only SUV I test drove, that had better braking IMO, was the Audu Q7.
In a test drive, you have to do a *panic stop* to see how the brakes perform....to see if they are to your liking.
The X5 had much better visibility out the rear window, which is a factor , for me, anyway.
I am well aware of the rather poor reliability of the X5, though it distressed me, wanted one at one time. A 4.4i to be specific.