I consider myself to be a pretty laid back person, but not so much when it comes to my scissors as I'm sure most designers will tell you. One pair is strictly used for cutting paper, one for cutting delicate fabrics, one for heavy duty fabric, one for threads, and a couple of junker ones for miscellaneous stuff.
My favourite pair is my Kai; 9 inch blades I think. The size, shape, and weight are perfect for me. I write and do most things with my left hand, but as the result of terribly made children's left handed scissors that could barely cut construction paper, I learned to cut with my right hand from very early on. I do like the weight of my Gingher, but the shorter blades aren't as favourable when there is a whole day of cutting.