PanAm
PanAm does not sell training, the sell licenses. You'll get the paper that says you know how to fly it. But when you go to do an assessment for a job, the examiner will more than likely send you home early.
I have used PanAm for both 37 and 320, as well as instructed there.
There are many good schools out there that will teach you how and then write you a license. If you are seriously considering a career in this game, then get a good foundation to build on. You will not get that at PanAm.