The best way to see which email templates perform the best for your clients is to test them. In the marketing world, this is called A/B Testing.
Here's how it works:
Take your information and develop two or more email templates that display the information differently. For example, build one in the Basic Builder that is simple text-based and use the Drag and Drop builder to develop a newsletter-style version.
From your Contact List View, select a list of Contacts to receive this information.
Click the Send Email button.
Select My Email Templates.
Select the 2 (or more) templates you want to test against each other and select Continue.
You will then receive this message. Select Run Test to continue. Now you have a test group!
To review how the two emails performed against each other, pull the Email by Template Report.
By A/B testing you can start to see what emails perform best with your contacts. Be sure to use this information for better results.