We have had an ongoing discussion about which list provides the best results with our stakeholders. There a few changes you can make to the way that you create your segments and how your report that has helped us respond with data.
For our business, we created different segments to enroll in a campaign by business unit and by list source. This may create a little bit of a mess on the campaign canvas, but I promise it will be worth it.
Once this is setup and the campaign is running you can use campaign analysis by segment (Listed under Eloqua Insight > Reports and Dashboards > Campaigns > Campaign Analysis).
This will give you all of the engagement statistics below that you typically get, but will also show the breakdown per segment.
This is an easy function that is in the system, that can help to tell the story of which list wins. Any other features/approaches you have found to answer this question?