Tough to say. The numbers go to Hasek. Both are unorthodox goalies in terms of style... and both have had limited playoff success. They only played 3 playoff games against each other, where Buffalo was definitely the stronger defensive team over the inept Leafs.
Because I've watched both of their careers quite closely, I see that neither goalie has had an advantage over the other. In the past decade, they've been 2 of the top 3 in the league for sure... but I honestly can't give you an answer.
Maybe it's because I'm a cujo fan, and I'm in denial, or maybe I think Hasek has been a wee bit overrated. Regardless, I think the answer to your question will be revealed in the upcoming season. Although, Hasek won't exactly be in his prime.
Curtis in his prime was/is a giant killer... Hasek was an acrobatic idiot.
You be judge.