Factor that controls FM and AM communication

helllo all
back to my prefered forum

i want to know
if i have an AM transmitter with specific power what is the required FM transmitter
to satisfy the same coverage area?
and what is the factors that control this?

The main factor which controls (and differentiate) the AM and FM communications is the receiver SNR

http://nptel.iitm.ac.in/courses/IIT-..._NoiseAMFM.pdf