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Ultrasound really may not be less schooling, depending on the requirements of the program you plan to attend. Many Sonography programs are only open to people with a prior degree, which means total college would be 4.5 - 5 years.

These are such different professions that I really recommend you job shadow both of them to get a feel for what they are really like. Every job has it's pros and cons, and there are probably elements of both careers that you don't even know about. Shadowing will give you some insight and help you decide.