Thanks so much for your response. I like how RootsMagic converts the GEDCOM to a broader pedigree that shows expanded family lineage of multiple people on a single page. Admittedly, the amount of information per page is overwhelming, especially for non-genealogists who lose track easily. MyCanvas (thru Ancestry.com) will produce a pedigree for a single individual or couple. An expanded family would need multiple separate pedigree runs.
To answer your question about GEDCOM exchange between programs, some fields in Ancestry do not transfer to Roots Magic, such as comments, images, etc. I think marriage dates don't transfer, as well. Lastly, the publications feature in RootsMagic isn't as sophisticated as MyCanvas. For anyone wanting to produce a professional looking genealogy text, RootsMagic isn't the way to go.