Depends on your own preferences and availability of sharpening kit. If the knife is used frequently and never sheated wet, there is no real need for a "stainless steel" unless a mirror polish is your thang. If you have a diamond stone, then ease of sharpening isn't really an issue. If you like patina and a metallic tang to acidic foods (which fades as you build up the patina) then go with the O1. Basically, lower maintenance but harder to sharpen and less "food taste issues", choose stainless. General purpose, used every day and slightly more care required, but can pretty much sharpen on anything flat(ish) but will never again (without lots of hard work) look like it's brand new choose the O1. There's a reason the vast majority of bushcraft knives in the UK are O1. We prefer the "old and well used" appearance over the "just bought, brand new (greenhorn)" look. It's easier to tell with an O1 knife which category the carrier falls into.