S3d is my general first go-to. I have cura installed, but since it only does absolute extrusion I only use it if I really have to. Can give good results, though. I have both slic3r & prusa's slic3r, I prefer prusa's out of those. I also have kiss installed, but it's the least used of them.
None of them are great at everything. I probably do 75% with s3d, 15% with prusa slic3r, and the rest in regular slic3r or cura.