Originally Posted by Manassa
Zale unified the title and posted only one successful title defense, a fight he almost lost, against Graziano. Then he was defeated by Graziano. He regained his title, but then lost it again in a brutal defeat. Zale was knocked out numerous times in his career.
Robinson won the title, lost it on a close decision, regained it in spectacular fashion, and defended it twice before retiring the championship. He then came back, regained the title, defended it once, lost it to a middleweight who would have pounded Zale into the ground, regained the title with a one punch knockout, lost the title on a very close decision to an all-time great welterweight, regained it, lost it on a close decision, some say should have won it a sixth time, and went on to have a decent post championship career. He was never knocked out.
Robinson is hands down the greater middleweight.