Pure Drive: Good for power and spin, but a tad hard to control. Harder on the arm, for sure, but easy to swing. Beginners through advanced level players are welcome to use without many issues, as long as they can handle a stiff feel. Beware, though...people on this forum have had issues with Babolat rackets particularly because of their stiff feel. Good for baseliners who like to hit hard shots with the same power and spin.
Pro Staff: Leaning a bit more towards control, with a lesser amount of power and spin. More comfortable than the Pure Drive, for sure, and similar swinging speed, but a bit of precision is much more welcomed. Intermediate through advanced level players should find this more than capable. I think it's more suited towards players who don't minimize their game to pure groundstroke rallies, but to people who slice, volley, and finesse more.