When comparing Xournal++ vs MuPDF, the Slant community recommends Xournal++ for most people. In the question“What is the best software to annotate a PDF?” Xournal++ is ranked 1st while MuPDF is ranked 2nd. The most important reason people chose Xournal++ is:
Fill shape functionality, shape drawing (line, arrow, circle, rect, spline), shape resizing and rotation.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Advanced PDF annotation tools
Fill shape functionality, shape drawing (line, arrow, circle, rect, spline), shape resizing and rotation.
Pro Supports pen input from devices such as Wacom tablets
Pro LaTeX support (requires a working LaTeX install)
Pro PDF, PNG export
PDF Export (with and without paper style);
PNG Export (with and without transparent background)
Pro Grid and rotation snapping
Pro SUPPORT
Pro Plugins using LUA scripting
Pro Audio recording and playback alongside with handwritten notes
Pro Super fast
It was written in C and opengl, so your hardware was used fully.
Pro Vim-mode shortcut keys
Super easy to use with rapid response.
Pro Excellent for presentations
Pro Annotation capability
With mupdf-gl, you can do most of the annotations and comments.
Cons
Con No print option
Con No two page mode
Con Not enough functionality
If you want "minimal," you got it.