Olfa (ergonomic -- curved) -- I have both 60 and 90 (Joanns 1/2 price). I use the 60 in the June Tailor Shape cut. I also have the 18 and 28 (the 18 is straight) -- I use the little ones to rip long lines of stitching that are not quite right . Have tried Fons and Porter (gave it to the church quilters) and ditto with Fiskars. Just like the feel of the Olfa. Tried the Martelli at a quilt show -- hits my hand in the wrong place so I did not consider it.