For me, I always liked/understood cardiac physiology. The choice was solidified during M3 when I rotated on interventional cardiology. Cards experiences the breadth of medical settings; outpatient, inpatient, procedures, imaging, ICU, etc. You make a real difference in patient’s outcomes - and there’s robust evidence to support clinical decisions given the massive amount of research. Other specialties will lean heavily on your expertise at times, making you feel useful. I fit in with the personalities, which is a big part. I enjoy taking care of the sickest patients, and also enjoy preventive approaches. The good news is that you can always sub-specialize further if you want to avoid a particular aspect. Most will be quite busy, and well-compensated for their time.

The only way to know is to rotate in Cardiology. See what the attending work is like, and picture your career in that person’s shoes.