i use a 45mm most often, my 60mm for thick fabrics, like multiple layers of flannel, fleece & minkee. 28 mm for precise, little cuts
as for brand i have quite a variety of cutters, i use them all- fiskars, olfa, dritz...i think there may be one or 2 more also, they are all in a basket & what i grab is what i use, sometimes i choose a specific one, depends on what i'm doing. I do use my pinking blade cutter too...works nicely if i'm going to prewash a wide backing.