You can't compare singers because anyone does like another style of music. The only way would be to review the difficulty of the techniques and if the singer hits the sound he wanted to.

And please don't ask senseless questions. They are annoying for every user on musing.io. Just ask yourself, who would like to know the answer of this questions as well ?

"What is the most sensitive part in a woman body?"
"Do you miss your high school teachers?"
"Who is the strongest politician?"