I use Fiskars 45 most of the time. It fits my hand and I find it easy to use. I have an Olfa 60 that I use when needed. Rarely, I use an Olfa 28.
A teacher insisted we get a smaller cutter than the 28mm for her class and I did, but have never used it again. In the class, I found scissors worked better.
I do use the pinking blade sometimes, usually before washing fabric. That's in an older cutter, not sure of the brand.