Hello student,

Both the courses you have mentioned above are good. The things matters here is your interest in a particular course.

Physiotherapy is quite different from a dietician or nutritionist.  As physiotherapy is a course in which you will student about the various body part and thier pain relief method.

On the other hand dietician is one who have knowledge of diet one should take to stay healthy and other food related knowledge. 

Hope it helps. 

Thank  you  :)