I think that your greatest job satisfaction will come if you teach an age group that is generally looking to learn. That would be grades 1-5 or skip up to the college level. Junior and Senior high schools will have you tied down with extra duties and jobs that aren't related to teaching at all. In public schools (generally) the students aren't motivated to learn and have many outside distractions and political considerations make things stressful at times. College age people are at least paying for the honor to be in your class. If they show up they are at least motivated to get their money's worth.
