When comparing PDF Expert vs Scapple, the Slant community recommends Scapple for most people. In the question“What are the best Mac software for students?” Scapple is ranked 4th while PDF Expert is ranked 8th. The most important reason people chose Scapple is:
You can customize your styles, background and font as you wish.
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Pros
Pro Fast and smooth
It is a software focused on consumption and not in editing PDF (yes, you can accentuate highlight, draw shapes and sign). They managed to build a nice looking efficient product in which they propose to do.
Pro Customizable
You can customize your styles, background and font as you wish.
Pro Flexible
It gives you the freedom to use visual thinking without the hierarchical rigidity of a mind map.
Cons
Con Expensive for what it offers
It is an item that improves aspects of PDF reading (which is free: Preview) but lacks professional features that other similar software has.
Con Missing settings options
Lacks basic settings like anti aliasing level.
Con It looks abandoned
Despite being a great software as it is, theres no update for more than a year : either to fix minor bugs, or implement new functions.