For a "last image review," I recommend neither. Instead, look through all of the official NBME form exams, scanning only for images, and do the questions with the images in them. NBME questions may not show up on the actual test, but the images used in the exams absolutely do show up. On one of the NBME's was a picture of a person with tuberous sclerosis, which I wasn't able to identify when I first saw it. I had the exact same picture on my USMLE, and got the question right because I knew ahead of time that it was a patient with tuberous sclerosis.