Montana isn’t incorrect in saying it is hard to compare players in different eras, plus the term GOAT is subjective in nature.
The funniest part of the TMZ video is when Montana’s wife outs him and says he calls himself the GOAT all the time at home.
My opinion and it isn’t stats related, but just the body of work makes Brady the GOAT. If the goal is to be highly successful, competing for and winning championships in the modern era at least, he is by far the best quarterback of our generation.