I've seen Koufax, Gibson and Maddox pitch. Take a look at their playoff/world Series body of work. Maddox to me is definitely a step below.
Koufax # 1, Gibson a close second. Never saw Paige, way too young to have seen anyone prior to 1958. But my grandfather, when he quit swearing, said Paige was crafty and unhittable the times he saw Satchel pitch..