A knife does not need to have a sharp cutting edge to render some one useless. It does not need to cost $100
I can tell you from experience the Smith&Wesson HRT dagger that cost $20 will kill some one and fast with only one puncture. When you stab your puncturing. One puncture greater than an inch in depth will send most people into shock making the uncombative. ....
.....If you stab some one with a dagger make sure you turn it 90 degress before you remove it to open the wound channel, thus making the person die sooner. you can practice this with a cardboard box MUSCLE MEMORY!!! for those high stress situations when training response takes over
To the OP get both if you can!
Good lord. I guess it comes with the territory...
G.