Split testing - Audience Insights

Split testing - Audience Insights

We intend to do split testing to check which of the 5 titles of our book converts better. What would be the best option for that?

We tried to choose Traffic option as a goal for the campaign in Audience Insights, but none of the three deep options (Delivery optimization/Audience/Placement) seems right for this task.

Or maybe we should just simply run 5 parallel campaigns? If so, how to force FB that they are presented to different groups of people and just once per person?

Regards JLA