Lots and lots of additional features. More formats supported, more view options, remembers the history of files, command palette to quickly access all function

Lots and lots of additional features. More formats supported, more view options, remembers the history of files, command palette to quickly access all functionality, way more keyboard shortucts, customizable keyboard shortucts, more customizability of the UI. Maybe I shouldn't comment on the competition but mupdf on windows is very bare bones.