You can sort by comeback, which is the highest the losing team's series win expectancy ever got; by average change in win expectancy, which might be used as a measure of excitement; and average leverage index, which could be used to measure suspense.
In addition to such factors, the quality of the teams is important. Some may prefer an upset. The comeback factor is fun if one is neutral or cheering for the winner, but heartbreaking for those who cheer for the loser, so some may find it difficult to
include it. And these are statistical measures. There is always the eye test to consider.