Comparing eras is difficult because of equipment (leather boots & balls as opposed to lightweight materials of later years), diet, training regimes etc.
No one has mentioned Stanley Matthews or Tom Finney, two of the best I ever saw.
But my vote goes for the incomparable PELE. If you never saw the sequence of him in the1970 (I think) Woprld Cup you are unlucky. Pele had everything, skill, speed, shooting and heading power and strength.
He even played in goal quite often. Probably the greatest all-round player ever.