Another fixed blade fan here. Bark River, Fiddleback Forge, ESEE, Becker, Swamp Rat, and even Ontario have many great designs, and are very affordable, especially Ontario and Becker. I like companies that stand behind their products, have useful (realistic) designs, and offer various sizes.
I don't have a favorite folder brand. I guess I like tradtional styles, but maybe I'll get a modern ZT or something down the road.