Distiller or Writer for Web Docs?   

Acrobat Distiller will always produce better quality PDF's than PDFWriter - which is one reason why PDFWriter wasn't part of the standard installation in Acrobat 5 and is completely gone for Acrobat 6. Both tools add metadata to PDF files - PDFWriter only uses the old 'InfoDict' method, while Distiller does both that and the new XML-based metadata.

Rosenthol, Leonard. PDFzone (2003). Design>Publishing>Software>Adobe Acrobat