I've never handled any of the SOG Seal knives, but the steel used in the SEAL Pup is Aus-6 which is a Japanese modification of 440A...it contains a bit of vanadium which acts as a grain refiner(smaller grains) which results in a tougher blade which holds a better edge than standard 440A...assuming the proper heat treat of course. The Elite uses AUS-8; a modification of 440B. I should probably mention that the SEALS use a lot of different knives, and the SOG series is just one of them. Beyond that, I can't say much since I don't comment on what I haven't tried. I'm sure if you Google on that particular series, you'll get some links to hands on evaluations.