How are you determine who is the best emcee? ?

how are you determine who is the best emcee? recently i put out "Who is the Best Female emcee in Canada" on yahoo answers and i got alot of stuff but one person came up more than others. and yes this has skills. but i'm just wondering how are we doing it now-a-days. back in the day it was clear people just battled until someone got tired and gave up but now in this age of murder, death, and kill it can be a health hazzard to battle or your career is ended with just one loss so is it skills,battles,sales,popularity,looks,me… how do we determine who is the best in Canada? get back at me with your views?