Two stacks of the same patch of sky, unnamed and in random order, on the same stretch. Judge what you would rather keep: sharp, round stars, clean background, no artifacts. Votes stay in this browser; export them to combine several people's.
Rating is a Bradley-Terry strength on an Elo-like scale (0 = average of the stacks shown; +100 means winning about 64% of pairings), counting a tie as half a win each way. The range is the middle 90% of 200 resamples of the votes. Tools with few votes have wide ranges.