Not sure if you’ve already made your decision but I’m a bit of a karambit fanatic. Currently own;
- Fox DART XT and 599 TiC
- Emerson Super Karambit
- Tops CUT4.0
- Ontario Knife Co EOD
- Cold Steel Double Agent
- Busse War Boar clone (couldn’t find a real Busse for sale)
- CRKT Provoke, my most recent acquisition
There are benefits and drawbacks to each.
As far as fixed goes, the OKC EOD and Cold Steel DA are two great options, both being reasonably sized. The CUT4.0 and War Boar clone are both a little too big for concealed EDC. If you’re going for fixed, I would look for one with a blade length of no more than about 3.5” just to keep it manageably concealable and carryable. I don’t have as much personal experience with it, but the Tarani Strider samples have a solid reputation and there are two versions, a larger and smaller, so you can pick the one that fits you best.
For folders, I would generally suggest avoiding liner- and frame-lock architecture as they’re generally known to be the easiest lock types to fail under the specific type of force that is often applied to a karambit-type blade (namely, putting pressure on the spine of the blade when trapping/manipulating limbs). That would eliminate the Fox DART, 599 (except for the new back-lock version), 479 (larger version of the 599), Emerson folding karambits, among many others. Not that these aren’t very well made, high-quality knives; but they are inherently more likely to fail when used as a karambit is intended. A big consideration for folding karambits is making sure you get one that has a method of deploying the blade with one hand. For this reason I generally dislike the 5.11 Tarani folding karambit, WE Knife 708, or any other folding karambit that relies solely on a flipper tab or thumbstud/thumbhole for opening, all of which are damn near impossible to actuate one handed when holding the blade in the reverse grip as a karambit is intended. The Emerson Wave feature is well known for fast and reliable one-handed opening and many companies have either licensed it or made their own version for their folding karambit blades - The Spyderco Karahawk is one such example, which also features a strong back-lock mechanism that would be more dependable. Other options here would be the Fox 599 XT or Mandiola Defense CDHK, both of which use a stronger back-lock mechanism and employ Wave-type features for reliable single-handed opening.
Another new option is the ingeniously constructed CRKT Provoke, designed by Joe Caswell. It’s built like a tank, easily opens with one hand, and the unique pivot mechanism and lock make it one of the sturdiest and least-likely-to-fail options for a folding karambit currently on the market. The Provoke also happens to be the karambit I personally EDC