JT is faster than Tracy. Tracy is probably a little better passer. Both with strong arms (maybe Tracy's was a touch stronger - watch that throw to Frankie Johnson to win the 85 national championship. If the Sylvania Flash doesn't catch it, it was going through the wall) and Ham had some serious touch. Without even peering at that article, having seen both of them play many times, they both have that confidence in themselves and that confidence from their teammates that they will find a way to make something good happen.
One big difference. I don't think the first thing said in every huddle with JT is "Don't drop the snap." Tracy would drop the snap a lot. Of course, he'd pick it up and turn it into a 20 yard gain.