Barricade 2 Reg- most people have found this shoe to be the best out of the barricade series. according to one of the threads.
Barricade 2 Mid- This shoe is the same as the barricade reg except that the part near the ankle is higher up, like basketball shoes. I tried these shoes once and i didn't really like them. I didn't feel the ankle were getting supported rather they were restricted.
Barricade IV- This model to me was stiffer and heavier than the previous models. The width was more narrow than the previous models, as adidas tried to make it glove fit like the barricade 2s.
Barricade V- This is my favorite model and the barricades newest model. I think its most flexible model and took the least amount of time to break in. The glove fit is perfect and i haven't had any problems.
Well, hope this has helped somehow and good luck in your purchase.