Picreel offers you the A/B testing option. So, you can identify which design attracts more customers. Once you create AB test you will have to create another design to compare two templates within one campaign. You don't need to create similar campaigns with the same design. One AB test requires one campaign, where one design is selected automatically, and the other you should modify.
To access this option, follow these steps:
In a while you can check your conversion rate and compare campaigns. Please, do it by clicking on Statistics of the A/B Test.
Also, you may modify overlays by clicking on Design A, Design B. Targeting options can be modified by clicking on Targeting.