Neither. I'd suggest if they're in the market for a Spyderco folder that's made in Japan they stick to VG-10 unless they want something with teeth, in which case they'd be better served by H-1. The way I see it, all that ZDP-189 offers is deferred maintenance. Sure, you only need to sharpen it 1/3 as often, but it takes 3 times as long so there's no real gain. The price for that is higher cost and lower rust resistance. As for Super Blue, it's even worse, since it tosses rust resistance straight out the window.