When comparing Inkscape vs PDF Reader Pro, the Slant community recommends Inkscape for most people. In the question“What are the best PDF editors?” Inkscape is ranked 5th while PDF Reader Pro is ranked 12th. The most important reason people chose Inkscape is:
Inkscape is GPL-licensed and maintains public repositories.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Free and open source
Inkscape is GPL-licensed and maintains public repositories.

Pro Opens lots of file types
Inkscape supports many common formats for import (including SVG, Photoshop and Illustrator) and its plugin architecture allows more to be added.
Pro Export to different file types
You can export and save your files for example as a "normal" svg, png, jpg, bmp etc. file.

Pro Cross-platform
Pre-built binaries are available for Windows, Mac and Linux. Inkscape can be built from source on additional platforms.
Pro Integrates well into a X11-System
Its uses the X11 icon theme and desktop theme(GTK).
Pro It can do anything
A very powerful software that can do pretty match anything!
Pro It's really easy and fun
You can edit and create vector graphics with Inkscape.
Pro Multiplatform
iOS, Android, Mac, Windows.
Pro Able to read a lot of formats.
Allow to view, store, and manage various document file formats, including iWorks, MS Office, text, images, audio, and video files
Pro Tie work on all devices together.
PDF Reader supports transferring files from email, web, and mainstream cloud storage services.
Cons

Con Very slow startup on some systems
Depending on factors like how many fonts you have installed, Inkscape can take upwards of 30 seconds to launch.
Con Uses its own SVG-format by default
Inkscape might use SVG as its default format, however this SVG's contains some additional SodiPodi/Inkscape additions that can be troublesome if you want to import the SVG into some other application.
Con Based on the GTK widget toolkit
Software is based on GTK, so it might not integrate well in non-GTK environments. It also requires many dependencies on those non-GTK desktops. It also adds dependencies to GTK-environments since it is written in C++ which requires the gtkmm wrapper/interface
Con Mac version is in worse shape than Windows/Linux version
Con Incompatible with previous versions
Sometimes backward compatibility breaks. For example, pre 0.92 SVGs are incompatible with later releases (due different default resolutions).
Con Y-axis inverted
0,0 coordinates begin in lower left corner, not upper left corner as SVG standards define.
Con No support for large printing machine system
No support for large printing machine environment, except exporting the resulting artwork to PDF.
Con Since 0.91 the gradient editor is gone
It is now only possible to edit a gradient on screen. but you can't set a stop to a specific percentage anymore.
Con Limited work with ICC CMYK color scheme
Support for ICC color profiles only in SVG files.
Con Not opensource.
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