Jody, tabatabai and bachman are simular. Tatum is a little more polished than the first 3. German does a blend of a few arts and uses AK concepts on the ground as well. Have not seen the other 2.
It was most interesting at the time (and now as well) about how German grafted Kenpo techniques and ne waza on the floor. The blending was most interesting... grapling on the floor is fun anyways though.
For the technical nuts and bolts I like Huk Planas's tapes, I have seen some of Tatum's tapes and found them lacking information of the beginning tapes, I have been told he goes into more detail later on.