Schema in RNC or XSD?

I'm tempted to author schemas in RNC as I like the syntax and convert them to XSD as necessary (as I'll be writing it - I'll be aware not to use or separate idioms that can not translate to XSD).

As far as I can tell, the RNC schema may not be used directly anywhere in the foreseeable future, so I am also considering simplifying the toolchain and simply author in XSD.

I don't know if it helps the argument but the schemas will be for documents (as opposed to XML messaging) so sections, paragraphs, lists, nesting - probably quite similar to html5 or docbook + domain specific constructs

This also reminded me that one can validate most of  (X)HTML5 with relaxng, but not W3C schema, which reminded me why I prefer to author this type of schemas in RelaxNG...

I am looking forward to hearing your opinions and I can provide more context and examples, if you think it's necessary. 

Lech Rzedzicki