I prefer to teach adults. I am currently teaching kids and I love them too but I would take an adult class over a kids class if I had a choice. The last job that I was in was excellent and I loved teaching company and uni students. However that meant that I had to prepare more that I would have to for kids but I found that when I went into the elementary school that I am at I had to prepare so much more than I thought I would!
My reasons for going into the elementary school and not the adult school was simple. Most of the jobs for adults have work from 6 in the morning and finish late at night on a split shift whereas teaching kids is a block shift. I hate split shifts so I stuff with the kids
My next job will be teaching company classes and I will try and teach in a school or two, like an after school program if it's possible.