once upon a time, both were respected makers. Puma in particular somewhat lost its way, but I have heard that recently they are trying to make a comeback. Boker's mostly have mediocre steel these days, but they are both still ok. As mentioned, purely ceramic blades tend to be very sharp and hard, but very brittle--as in if you dropped it on a concrete floor, you might break the blade. There is a ceramic blend now if I'm not mistaken that somebody makes, and there are some of the finnish/norwegian trilaminates. I'm not mecessarily a huge fan of all the wonder steels these days--often they also are brittle and chip edges easily, and are a pia to resharpen. To me its hard to beat some of the old case chrome vanadium, marble's 52100 etc type steels