Hey,
Microbiology and Physiotherapy are two distinct fields and just can't be compared on any scale. Both of them are equally good and it depends on your interest what you want to study.
Microbiology is that branch of Science which deals with microbes and infectious aagnts which cannot be seen with unprotected eye.It includes the study of hos microbes interacts with other living organisms and the ultimate effects. Microbiology is a vast discipline in itself. You can work in healthcare firms,forensic Science laboratories,environmental organisations,Food research,pharmaceutical and so on.
On the other hand,Physiotherapy is the treatment of injuries through exercise and massage etcetera
It helps you add life to the movements of people.
You can work as a physiotherapist after your Bachelors in Physiotherapy or go for specialisation.
This field has huge scope.
Hope this helps.
Good luck.