I was on the exec board for our surgical interest group. I put out a questionnaire to the M1s. Out of ~180 people, we had 120 people who said they were "interested or very interested" in a career in surgery. Of that number, 60% said they were considering gen surg, ~35% ortho, ~35% cardiothoracic, ~30% transplant, ~25% neurosurgery, ~25% trauma/cc, ~20% plastic, ~15% ophthalmology, ~15% vascular, ~15% surgical oncology or breast, ~10% otolaryngology, ~10% urology.
So, we had a ton of students who were interested in surgery as M1s, and they were mostly interested in "hardcore" surgical fields.
Compare that to our match list: 3 ophtho, 11 ortho, 3 oto-hns, 10 gen surg, 1 cardiothoracic, 1 urology.
So that 120 went down to less than 30, with ortho being the most popular. Just interesting data.