I would have to say in my honest opinion that the OLFA brand is best - as for me the blades have always stayed sharper far longer than Fiskars and are the brand most regularly on sale. Which means - I can stock up on blades and different sizes versus other brands that are just as good, but that don't very often go on sale at any of my local craft stores.
Explosive blessings, abundance and inspiration to you all!
- The Creative Seamstress