Depends on what the knife is for specifically, different uses will favor different attributes
for a utility knife you will likely want a knife that holds it’s edge for a long time
in other cases you might want one that can be honed to an extremely sharp edge
In a skinning or fileting knife you want a flexible blade
Length and thickness, shape, and weight of the blade will depend on the user and purpose of the blade
and then of course there is the handle, the hilt, and the balance which again depend on what the blade will be used for
Latest Answers