Medical: salary generally higher depending on your speciality however work conditions are tiresome and you work super long hours. I'd say medical is very challenging if you like a challenge but can also be stressful and emotional but rewarding too and you're asked to work in a flexible constantly changing environments
Business: salary generally starts off average depending on your speciality but you can easily work your way up the ranks to a better salary. Hours are typically your average 9-5. Probably a more boring job and nothing much exciting happens but it's still a pathway that can have great benefits in terms of salary. Probably less stressful than medicine path.
Depends on what you can handle and what you're like really. What you value more etc. I study business but it's boring as hell. I can't do medicine because the thought of operating on someone creeps me tf out XD Its a matter of preference really.