The 5x5 is nice because it's so easy to run. We shoot it every few months as a quick drill after a match. I don't know how accurately it mirrors full classifier scores since it loses several of the harder bits like weak hand, moving, and distance. Still a good baseline skills test, but I wonder if it could bump people to a new rank unnaturally. The 72rd is a little more streamlined than the 90rd we shot back in the day, but retains all the necessary skills.
While USPSA is wildly more popular, and IDPA has mostly died off around here, I think IDPA has always had a better classification system and scoring. Too bad they suck at everything else.