I live in the Dayton area and Im presently going to Sinclair and have been the last 6 quarters. Before that I went through the program at a local vocational school. I decided to go on to Sinclair and take there program and even though some of it was a little bit redundate Im still glad I did it. Sinclair is more into book work lots of theory and computer simulation. The vocational school was more into hands on and what you will experince in the field.
You certainly can get by with one or the other but for me I really learned a lot in both. However as most of these vets on here will tell you , your real learning will be out in the field working with a seasoned pro. Also dont forget about the harsh winter days or the extrene hot days that you will be up on the roof working on roof tops and it is not a 9 to 5 job like the one you have now where you are working inside a controled enviroment.