If you want to be the one doing your best to save someones life then medicine, if you want to be the one doing your best to enhance someones life then physio. Thats not saying doctors dont enhance peoples life, its just a general statement to highlight that the physios speciality is enhancing physical symptoms while the doctors is enhancing medical symptoms.

For example on a stroke ward, a doctor will provide the necessary medicines etc to give the person the best chance of survival/recovery but the physio will be the one who works with them to try and get them walking again. It really depends on you. When push comes to shove, a doctor is still the top dog in the MDT (multidisciplinary team) but it depends on what you get a buzz out of.