LesPAC offers a tool that allows you to compare different ads. This is the "Comparison Tool."
To compare ads:
A: Click the "compare" link when you're viewing the details of the ads.
B: The "Comparison Tool" is located under the search box in the blue area. The number in parentheses is the number of ads you've added to the Comparison Tool.
C: By clicking on the "Comparison Tool," you'll find the list of ads you've added. Tick the ads you want to compare, then click the "compare" button. Note that you cannot compare more than 4 ads at a time.