We use to use Aspose.PDF for converting documents to PDF format. We’ve since dropped Aspose.PDF in favor of Aspose.Words (SaveToPdf). However, we only recently noticed that there is a slight difference (although, some of our client feel this is a major issue for them) in quality between the two. The Aspose.PDF image quality is better than Aspose.Words image quality. Especially around text. See the attached documents.