Cosmic Encounter was the first of many games based on the idea that you get some special power that allows you to break a rule in the game. Which powers were best?
I include two answers for this question, one based on my own data set, another based on a combination of 3 different players' data sets. Both sets of data are from the early 1980s, based on Ted Schmeckpeper's data collection method (http://daveola.com/CosmicEncounter/Magazine/Encounter.1.3.pdf): Each game is worth a number of points equal to the number of players, and these points are divided among the winning players and their powers.
In addition to the two answers I provide below for the 1977 EON version of Cosmic Encounter, this would be a great place to collect additional data sets on any of the more popular versions of Cosmic Encounter. So feel free to post as answers more data sets, links to data sets, or tabulated results.