Hi everyone

I'd like to test how all placements performs vs just story placements for a campaign I'm currently running. How should I go about this? Do I duplicate the ad set in the same campaign, and have the copy target all placements? I'm worried this could cause the two ad sets to "cannibalize" each other as they'd be overlapping in targeting. Or should I create a completely new campaign and run the all placements test there? What is a good practice for this?