You can compare performance among different pages you're monitoring.
Go to the Compare page and add the pages you want to compare.
You can view aggregate statistical metrics rather than each individual test result.
First, open the date dropdown and select Stats Mode.
The page now shows aggregate metrics, using the average by default. You can change the bucket size to group data over a larger timespan.
If you tick Aggregate metrics across all pages you can see metric averages across multiple pages.
You can compare two specific test results, for the same page or across two different pages.
You'll then be able to compare the two test results: