I disagree, but you're entitled to your opinion, of course. Nobody, which includes you and me, has seen each one of these players in their prime.Cliff was definitely a talent. Unfortunately, at his best, he was still playing 1/2 to a full ball under Efren, who was also at his best..
There are no digital recordings of players from yesteryear. Word of mouth and regional favorites goes a long way as far as these "Whos the Best" threads. That's what happens on discussion forums sometimes.