Willie did dominate in his era more then Reyes, but... First off, I believe most of Mosconi's championships used a round robin format. You know that the better player will do better with this format. One bad match will not cost you the tourney. Also, many of the "championships" in 14.1 were ,in reality, challenge matches between two players. I think Efren would have won many more championships in his career if he only had to play one opponent over a long period of time. Lastly, 14.1 has a much less luck factor then 9-ball. Amongst the top players, certain tournaments are won by the person who breaks the best. One pocket also has much less of a luck factor then 9-ball and see how Efren has done playing that game. He has not done too bad playing 8-ball either!
Plus Efren is nicer then Willie!