In Physical Examination, we used both Bates and Degowin but Bates was our standard textbook.
Bates was good coz it is easy to read, has lots of pictures and diagrams with it and its very organized in a way coz it starts with a review of anatomy before it starts with the physical exam proper. It has clical correlation also, but it doesn't touch on those correlates that much. It just gives you that if you have like this sign or systom, you might have this disease or condition.
Our school has this original Bates videotapes for every system and we watch it after the lecture about that system was given. It was helpful coz it demonstrates how really to perform a P.E. and how to do it right. It gives you a picture on how a basic P.E. is done by a practicing physician. So that is why, I guess, Bates is considered as the standard.
DeGowin, on the other hand, I find it more detailed. Though its smaller than Bates, it definitely contains more! Its very handy and easy to read too. When I had P.E. I read it by my bed before I sleep! 🙂 It gives what Bates lack, the differential diagnosis and all the clinical presentation of the case. Though it doesn't have pictures per se,(only diagrams) the description of the test or exam you need to perform is graphic and easily understandable.
So, I guess I would say that you can read Bates if you want to know the technique and supplement with Degowin if you want to get deeper on what you got from the P.E.
Hope that helps! God bless!