If I understand you correctly, you're saying Elvis had more vocal range? I agree with most the rest of your post, except this. Prince did have much more range than any you mentioned.
Here, listen & see for yourself....He can hit the high notes as well as the deep and all in between
Nope... he goes into falsetto when he goes high. Elvis had better natural range and more control. Prince is good.. one of the best... just not in the same category with the greatest vocalists.
Mariah Carey is one of the greatest vocalists. Does that mean she's bigger/better/more famous than Prince? Hell no.
Well I think we're all getting into comparing apples and oranges with bananas and grapes. What IS "famous" or "bigger/better/more famous" in terms we can actually measure comparatively? Elvis had an impressive string of gold and platinum records spanning many decades. They don't call him The King for nothing. Elvis has the motion picture equivalent to about five Purple Rains at least. Not very many people in the country can just go meet with the president because you want to.
I was simply stating my opinion. Prince has good range but he is mostly known for his style. Few people have ever been exceptionally great at his style... James Brown... that's the short list. It's not because of vocal performance. Celine Dion has a freaking awesome voice, and she sells a lot of fucking records man.... She is nowhere close to Elvis.
My observation is, Elvis is the better vocalist between he and Prince. That's all. His voice was what made him famous. If you listen to his old music you know this well. He could go from deep baritones to high and in full vocal control but he could also make you feel what he was singing. I think that Prince also has this quality, which is ironically what made him famous and draws the two together in this argument. But Prince is more about style and he did that well.
In my "most influential artists" list, I am not talking about "fame" or popularity but influence. That's a different criteria. People can be very gifted singers and not lend much influence to music. They contribute, some people are inspired by their talents, but they don't really influence others or have an influence on culture of the times. That's why my list didn't include bands, it's about the artist and their individual influence as an artist. That's an
overall thing... not just voice or record sales.