I have used both texts, and in my humble opinion the AAOS text wins hands down. The biggest problem that I have with the Brady books is that they are not consistent from chapter to chapter. I have also used the Thompson-Delmar books.... and I would still rather teach out of the AAOS book.. Go Orange!
All EMT books need more detail. The Anatomy/physiology alone should be no less than 1500 pages and should consitute 2 semesters in itself not including the rest of the program.