They do ask something quite similar:
"Our annual owner-satisfaction survey, conducted by the Consumer Reports National Research Center, asks subscribers a single, revealing question: Considering all factors (price, performance, reliability, comfort, enjoyment, etc.), would they get their same vehicle if they had it to do all over again? "
Not exactly the same as "which car they would rather have," as, for example, lots of people would rather have a Ferrari than a BMW, but for practical reasons, such as lack of funds, never will.
Under the classification of "Large and Luxury SUV," the X5 is not in the top eight (they only listed the top eight in the summary I saw." Under the classification of "Small SUVs" the X3 came in third, after Mazda CX-5 and the Honda CR-V, but ahead of the Audi Q5 and Subaru Forester.
Remember though, these ranking have nothing to do with any "hard" data or testing -- it is simply a ranking of how many current owners say they would get the same vehicle if they could do it over again. No more, no less.