A friend of mine used to teach for PR...she had to audition, teaching anything that was of interest to her, in a 5-minute lesson. They review you on personality, ability to demonstrate knowledge and enthusiasm for your topic, and ability to clearly explain it. After she passed the audition, she had to do fairly intense training, and then pass another audition (teaching a GMAT lesson) to get the job. She loved teaching for them, and she spent a lot of extra time outside of class helping her students, so it definitely isn't a "grab their money and run" approach. From what I have heard about the two companies, PR seems to care more about the students, whereas Kaplan spends a fortune blanketing college campuses with flyers for their courses. I live near UVa and once had to post some flyers of my own, and I swear, there was a Kaplan flyer on every single bulletin board I found.
So I would vote for PR if you want to teach for one of them!
Oh, and Kidderek...the PR class comes with a ton of materials, including the OG. I have seen their course materials...they are not the same ones you can get on Amazon. They go a lot more in-depth. Kaplan apparently uses the same books in the course that you can buy anywhere, but they did at least recently include the OG for homework assignments. (They didn't previously tell students it even existed, so I guess that's a step in the right direction!)