What is the difference between regular Fractora vs Fractora Firm?

I recently had a regular Fractora treatment about 3 weeks ago for my acne scars on my temples and cheeks. The treatment was less than 15 minutes and it felt like shocks each time it was placed on my face. I saw a bunch of videos on a different one called, "Fractora Firm" and saw it was an hour plus treatment, it was a warming rub on the face. I'm wondering, what are the differences, for healing time and price between both? I would like to know before I go in for my next treatment next week.