If you want to take advantage of the new dashboards, you have a few options:
Use the email program's A/B test functionality as you mention in your post and set the test type to be for "Whole Emails." Select the two emails that you want to test and then set the sample size to be 100%. Next, set the metric you are interested in observing (opens, for example) and set to declare the winner manually. You can then schedule when to run the test and when/where to receieve a results report. Approve your program and then wait to collect results. In the future, you can either declare a winner to use moving forward or discontinue the program altogether.
You can use Champion/Challenger functionality to test any email you are sending within Marketo. If you already have a campaign that is sending an email, you can right-click on the email asset and select "New test." From there, set the test type to be "Whole Emails" and select the challenger email you'd like to test the selected email against. Clone that email asset into the test and then set the distribution to be 50%/50%. Next, set the metric you are interested in observing (opens, for example) and schedule when to receive a results report. Approve your test and then wait to collect results. In the future, you can either declare a champion or discard the test altogether.
Based on your scenario, #2 is probably the best bet. You'll be able to view a nice results dashboard by clicking on the email you are testing! Justin
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