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What's the difference?
Both Panels and Borders have their own markup file, but the markup is used in different ways:
The Border component inserts markup before and after its child components.
{panel}
<html>
<body>
<div wicket:id="myBorder">
<!-- Border markup -->
<span wicket:id="myContent">content</span>
<!-- Border markup -->
</div>
</body>
</html>
{panel}
The Panel component inserts markup into the body of the tag.
{panel}
<html>
<body>
<div wicket:id="myPanel">
<!-- Panel markup -->
</div>
</body>
</html>
{panel}