SuperSlicer is based on PrusaSlicer by Prusa Research. PrusaSlicer is based on Slic3r by Alessandro Ranellucci and the RepRap community.
What are SuperSlicer main features? main new features/differences?
* Custom-made generated calibration tests.
* new settings to fine-tune the top surface quality, like 'only one perimeter on top'.
* A 'denser infill' option for supporting the (solid) top layers.
* Better Thin walls (anchored inside the print, no more random bits at the ends, embedded in perimeter loops).
* Options to change holes dimensions and/or geometry, to print them at the right size.
* Better overhangs (add perimeters if needed, slice them in opposite direction each layer).
* Brim rework: many more options (inside, outside only, 'ears', per object)
* Some new seam options, to help hide them.
* Built-in calibration prints
* Built-in object generation script
* Can join perimeters into a big one to avoid travel moves.
* Many other little options and corrections (like the filled concentric pattern).
* It has also all the current slic3rPE/PrusaSlicer features.