What to show when no data is available yet?

I am having a difference of opinion... with myself.

My web application has a section for an order preview. The user can select a specific order and some statistics of this order will be visible in the preview section. The order stay in this section until the user selects another order to preview.

The next (and last) section is for a table of orders.

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So, my issue is about what to show the first time users enter the application. One part of me wants the layout to be clean, and if it is empty it should be clear that in actually is empty

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But some part of me want to show the user what it could look like

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What do you think the users prefer? A informative message with dummy data in the background or a clean background?

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