We\'re doing a mapping process from an XML file generated by a legacy system to EDI 834/837 files. We have BizTalk 2010 and are using the Microsoft built in EDI schemas.
Not really, I prefer XSLT too. It's easier to document (using comments in the source) and therefore to maintain. However, keep in mind that in BizTalk 2006 R2 you could not import external XSLTs, which reduces your options for reuse. I have no idea if this has changed in subsequent versions of BizTalk, that's for you to find out and perhaps let us all know...