To be short, overall rating of slicing engine I tested -
Slic3r - 6
Cura - 8
Simplify3D - 9.5
I wasn’t sure if it’s suitable for official to recommend this software. However, after using for a while, I came out with the conclusion - using Simplify3D do really improve printing quality.
Cura did pretty good job as well, and we’re embedding this slicing engine into newest version as well. I hope there will be CLI interface for Simplify, so we can generate simplify3d gcode in FLUX Studio directly in the future.