Elvis's style, lyrics and songs (the more popular, famous ones) were stolen from others... So one point one for Frankie.
Frank Sinatra declared he wouldn't perform at a casino in Vegas unless they allowed Sammy Davis Jr. perform as well.. (Very anti-racist). One point for Frankie.
Elvis was a BIG mommy's boy (He knew how to respect her). One point for Elvis.
Both were drunks. Minus one for both.
Frank Sinatra was a connected man... 1,000 points to Frank Sinatra (no there is not a mobster in my house pointing a Desert Eagle at my temple forcing me to type this),,,,
In conclusion, Frank Sinatra wins, his music is original, fast and slow, softer on the ears...
Hope this helped