This might be shocking to some people, but people's courses are different at different schools. I might have a professor who tests strictly off his slides. You might have specialists from all over the hospital come in and teach you. John over there in the corner might read big robbins cover to cover. Lets see if i can spin it so you can make the decision yourself.
Kaplan is strictly minutia detail. The vignettes are long and often purposefully tricksy. It gets frustrating. They have references to page number in FA and MedEssentials which makes annotating pretty cool. Their explanations often suck or are really short lived. Useful for your course? likely not. useful for studying for the Boards while in class? You decide.
USMLE world is more Step 1 style questions. The vignettes are still long but the explanations (and pictures) are smoking hot. The problem with World is that they really harp on like 10 things in each block. For example, they ask about Osteogenesis Imperfecta like 10 times in a 2000 question block. Well, if you select "Bone Diseases" and there are 50 questions, 10 of them which is Osteogenesis Imperfecta, you are not getting the full spectrum. I made up those numbers, but you get the idea.
Other qbanks i see as superfluous. To be honest, you're better off doing Robbins Question Book. The questions are hard, relevant to what youre learning, and have exceptional explanations. Leave the powerhouse Qbanks for when you are done focusing on learning new material and are able to review.
Bottom Line: You have to decide for your course, but go out and by Robbins Review.