A member of the Finnish military once taught me an interesting lesson. What do you want to achieve on the battlefield? In his real-world example, your preference isn't to kill because dead people can be ignored. You want to maim, because that ties up one or more other people to care for the wounded or produces distracting noise on the battlefield (screams). This plays on a basic human "weakness" (from the perspective of battle): compassion.
So, the real question is, what are the weaknesses of your monsters? Are they large or small? Are they organized or not? Will they care for their own?
Further, you want to consider the value of a particular kind of wound. A bludgeoning weapon (club, metal rod, mace, flail) disables quickly but is difficult to get a kill in a single stroke. They're very cheap and easy to manufacture. They break bones and render muscles useless.
A medieval sword (like a Great Sword or a Bastard Sword) is little more than a club with an edge to pierce armor. They took a great deal of strength to use. Axes are not much different than a sword, basically favoring attack over defence (more energy on attack, bad balance on defence).
Curved swords were generally used by cavalry as the curve gives both balance to the rider and reduces the ability to become stuck in the victim. (The Japanese Katana isn't curved for this reason. It's curved due to the tempering process.) The added inertia from the horse meant massive almost always fatal damage. You find some cultures on earth used them as ground weapons, but they are (in my experience) unweildly and only good for creating slashing wounds, which are not as debilitating as the broken bones of bludgeons.
Renaissance weapons like rapiers and foils were piercing weapons, not slashing weapons. As armor became less and less valuable (principally due to improved ranged weapons), agility became more valuable than strength. But you must hit a vital organ quickly to disable your opponent. They're not that great at maiming.
Spears and Pikes are good for charging oponents, but they're often use-once-then-draw-your-sword weapons as they either (a) leave your posession or (b) break upon impact with the victim.
Finally, what are the manufacturing capabilities of your people? Bludgeoning weapons are, as mentioned, cheap and easy. spears and pikes are also easy. Rapiers and foils that don't bend quickly on use are more complicated.
So, what are the goals, weaknesses, and resources? Is it easier and cheaper to maim the attacking horde, killing them latter, or must you kill first and ask questions later? Can you manufacture elegant weaponry, or are you forced to use more basic, brutal methods? Are your monster's bones easy to break, or would cutting muscle be a better maiming solution? Is precision needed to gain a killing stroke, or can you disable easily with blunt force?
I apologize for answering your question with more questions!