Fatal cuts are pretty much limited to the neck, inside of the arms and inside of the thighs.
You need to stab in a knife fight. You need a blade that can both cut and stab. At least a 4” blade with 6” needed for jackets / fat.
Karambit style blades cut very well. But they only cut. I think they are a poor design for a weapon.
Daggers do not cut well. Again, why limit your ability to attack.
This is a knife that can both cut and stab well.
Deep belly and mass for cuts and point geometry close enough to stab well (not quite linear in this case but good enough). Has many other good attributes including being comfortable in the pocket.
I prefer a good Bowie knife but the authorities frown on those.