If you want a direct, compact comparison between Illustrator CS6 (licensed), a typical “portable compressed” repack, and Inkscape (free) laid out in a table, say so and I’ll produce it.
: Adobe has officially discontinued the Creative Suite (CS) line. There is no legitimate "free" or "portable" version of Illustrator CS6 provided by Adobe. Software Status and Alternatives Adobe Illustrator Cs6 Portable Highly Compressed Free