I use slic3r. Some neat features allowing you to really nail down presets specific to various sections of features. Being able to mix and match presets of various sections of features makes fine tuning easy and removes alot of the pain that would typically occur when changing nozzle sizes for example. The preview feature rarely gets used on my setup as pronterface already does that for me. I notice much of the pro features of kisslicer already exist free in slic3r.