I have both fiskars and olfa cutters of different styles. I have also worked with a wide variety of other brands. The one I like best is the olfa 45 size ergonomic one that locks. The ones that you have to put pressure on to get the blade to come out and cut also wears my hands out. It feels like my hand is cutting the fabric not the blade. Some of the fiskars the blade looses up or pops off or the lock disengages. I have never had that problem with the olfa. Size wise 45 is what I usually use but as I get better at cutting stacks of fabric, I will most likely invest in a 60 size. Some people like the small ones for cutting curves and circles. But since I don't do that yet, I haven't purchased one.