I have never bought anything besides the basic carbon steel knives with the red plastic handles. Both factories seem to use equally good steel. Grinds might look a bit different, I think KJ Eriksson makes a slightly beefier blade. In my opinion, Eriksson has a lot better handle on their model 510/511 (
link to .pdf catalog) compared to the
Frost's model 640 "Viking". I especially like the KJ 510, it having no real finger guard, and thus having a ambidex. sheath.
The guard is pretty useless, since with these kinds of knives any cuts requiring the force needed to dislodge the knife from the hand are done in a drawing motion - opposed to being pushed tip first into something. Stabbing is of course a different manouver alltogether, and should be done with an ice pick grip, thumb resting on the pommel. Anyway, the KJ Eriksson grips a lot better when pulling the knife, so to speak.
I used a Frosts model in the army though. Bought it from a gas station when I finally gave up on my utterly POS Gerber folder. Worked good enough in the field kitchen. I wasn't the only one with this model. All the army trucks had one fixed in the cargo compartment for cutting the soft-top in an emergency.
I eventually shaped the handle of my Viking to my liking with the hot knife on my
Portasol SuperPro and some sandpaper. Added a few notches and grooves too. Sloppy work, looks pretty horrid, but works great. I can actually get a very positive saber grip with it, and a most comfortable reverse (unintentionally though). Not that I'm using it. It's rusting in my drawer along with other service memorabilia.
Speaking bout those days... My sergeant found a Mora 2000 somewhere. Someone probably threw it away after using the thin tip as a screwdriver. It was his throwing knife from there on. I don't think he ever used it for anything else. I did like the handle on that thing, sheath was decent too. And it was much easier to throw accurately (with no throwing skills whatsoever) than the basic models. But the blade was too strangely ground and
stainless for me. I think it might make an excellent hunting/game dressing knife.
I've handled the Frost's model 440 (
link to .pdf catalog page), and it seems to be a pretty decent for throwing in the pack as a backup, or in the survival/first aid kit. IIRC it has a slightly sticky handle and the sheath holds such a light knife very securely.
On a side note, I'd really like to get a few of the KJ Eriksson 1472 blank blades, and work them up as some sort of neck knives, or mayde make a lapel sheath...
Sorry about the bad English. This time I'll blame it on the drained-and-failing batteries in my keyboard.