Fair comparison
Universal Document vs DocuSign
DocuSign focuses on electronic-signature workflows. UD focuses on the document object and its state; signing can be one capability attached to that object.
Not a forced replacement
UD is designed to coexist with established formats. The practical question is which object should carry structure, state and lineage, and which formats should remain compatibility exports or required delivery formats.
Evaluate with one real workflow
Compare how each approach handles revision, finality, portability, machine readability, provenance and recipient friction.