Hi,
The ${...} syntax does not allow you to access a runtime variable like your "rowData" object. So, the <xp:include> tag is of no help for you.
Using a rendered attribute is also not a good idea, because it will make you generate a very big component tree.
Instead, you must use the <xe:switchFacet> control from the extension library. It is also available in the Domino 8.5.3 Upgrade Pack 1.
To use it, simply create a custom control per form (supposing your forms are named "Form1" and "Form2"), and then,inside your repeat control, use this code:
<xe:switchFacet selectedFacet="#{javascript: rowData.getItemValueString('Form')}">
<xe:this.facets>
<xp:ccForm1 xp:key="Form1"/>
<xp:ccForm2 xp:key="Form2"/>
</xe:this.facets>
</xe:switchFacet>
Google for "XPages switchFacet control", and you will find a lot of interesting information.
Regards,
Lionel