This reminds me of the difference between Strikers & Forwards debate in Football (Soccer).....
Paul unquestionably has (had) the better singing voice over John.
But the better vocalist was (is) probably John.
Example:
Great Male Singers: Elvis Presley, Frank Sinatra, Roy Orbison, George Michael, Elton John, Smokey Robinson, etc.
Great Male Vocalists: Bob Dylan, Lou Reed, Nick Cave, Thom Yorke, Kurt Cobain, Sly Stone, etc