Unlike many things, when it comes to Mora's it's six of one and a half dozen of the other.
I used to be a carbon guy, big time. Ihad an old Mora number 1 with the laminated blade for 20 years, It had a patina built up on it, and I never had a problem with rust. I just wiped it down now and then. By now and then, I mean every boring when I set out, and every evening when I was done with dinner. A carbon blade is not going to rust away in a few hours or a day.
Having said that, I have to admit that my view of steels has changed a bit. I now admit that in most cases, it won't make a hoot's bit of difference between carbon and a quality stainless. And Frost's does use a good stainless, Sandvik 12c27. My better half has had a stainless mora with a green plastic handle as her day pack knife, and it's held up under her female attitude of using a knife for anything it was not designed to do. Prying up the patio stones, ice pick, scraper for ceramic tiles, and she even cuts things with it on occasion. Miracles never cease.
In all seriousness, Karen has used the livin' heck out of her stainless mora, and used it harder than I ever used my old wood handle number 1, and it has been fine. No broken blades, no huge chips in the edge, and I sharpen it for her when she complains it's dull, so I see how it stands up. She likes it because of the way the plastic handle is molded onto the blade tang, so it cleans up nice after she uses it for kitchen duty.
It's all in what your asthetics are. But when I comes to Mora knives, they are all great.
Carl.