I have always carried a Case pocket knife. The first knife I bought, with birthday money when I was in elementary school decades ago, is a trapper I still have. I have one or two other brands. But when I get the itch for a new knife I shop for another Case.
What pattern do I prefer? I carry one for days or weeks or months, and then another for days or weeks or months. Right now it's a large stockman I just bought. Or if I'm wearing dress pants it will be the peanut, small stockman, or sway back gent for that day.
Scales? Almost all are bone. I never thought about it. It's just what I buy.
Steel? Most are CV.