You want to help people. How much time and how hands on do you want to be?
Ultrasound. Very necessary and respected field. The only person who would think less of you would likely be you. You see patients for a short period of time and work mostly with doctors. What you see helps guide plan of care or even helps diagnose.
Dietary. Depending on where you work, could be more chart review and offering recommendations to providers versus actually talking with patients. Sometimes frustrating when your recommendations arent followed.
Nursing. Lots of options. You dont have to work night shift. I choose to work directly with patients. I work with many members of the healthcare team. I truly feel like I make a direct difference in patients lives.