Any of them will do. The key is to not let your adversary know you have it until it's too late. If the only weapon I have available is a sharp stabbing weapon like a pen or knife generally the best thing to do is let them close. Pull it out last second.
Human reaction time is generally .2 seconds, to do anything about what you just realized, best case .2 seconds. That's 4/10ths of a second or more for one to react and counter an attack. I am not adding anticipation of an attack into this equation.
Anyway, my point is if you have used a little guile you may be able to help your situation by reacting first. If the goblin is clearly going to do you harm and you go on the offense it can mean all the difference in the world.
Look to target the temple, throat, eyes, groin, underside of the arm pit, kidney.
If you have a slashing weapon; throat, eyes, wrists or inside of the forearm. (this is why I block with the OUTSIDE of my forearms.)
Those are my immediate targets, and I prefer to stab. Don't stop with one shot either, you need to hit him multiple times, multiple locations. Pound him with a flurry of activity. If you must use force, pretty much every attack had better be a lethal one.
As for the two pics Shawnee posted, I'd take the one on the left. I prefer fixed blades. Also I would rather have something smaller, and sharper. If you're a slasher you need a sharp blade. When blood vessels are torn they have a tendency to constrict.
non-gun weapons to face. Both are relatively small and come in belt pouches so a hunter or camper could have either readily available.
