You can review detailed statistic about each important entity of affiliate program (Affiliates, Campaigns, Banners) in detail of each type of information (tab Stats).
This will help you to optimize your campaigns and banners or compare two campaigns side by side (in Blue Aero theme you can open multiple campaigns in same time and compare them).
Report will show you same data as trend report, but will compute only with data of give affiliate, campaign or banner, which you selected.