From what I know of John Charles, he and Alf Wood were cut from the same cloth. I never saw John Charles play so I can't say who was the greater.
I saw John Charles play at (would you believe) Boothferry Park. On that day he left my hero, Viggo Jensen, for dead. John had it all. Pace, head, either foot and enormous presence. When Juventus celebrated their Centenary in the late 90's John Charles was voted as best foreign player ever to play for them by the fans.
When Leeds approached him at his home in Wales his Mother, God bless her, said, "He can't go, he hasn't got a passport"!
Legend.