I shall present myself: I am Alfara Gal Strid, proud leader of a clan of Arat'nie - what you would simply call "winged humans".
I come to you with a troublesome question. You see, for a long time we winged humans have faced war with your kind, effectively keeping your lot at bay using ranged weapons and dropping projectiles such as flechettes, arrows, bolts and darts using the ability to fly to our advantage.
Now, though, since some recent diplomatic incident between the clans, we need to fight one another, brother against brother. Of course, this changes everything, since both parties are able to fly. What weapons would be best to fight in this situation?
I'm especially concerned with melee weapons. As you might recall, our wings are connected to the body at out lower back, above the hipbone, and make us capable of vertical flight, along with some impressive aerial maneuvers. Our wingspan is quite wide - generally more than the length of our arms.
We need weapons able to fend off our enemies, without risking to injure our wings as they flap. I'm concerned that spears, or even swords, might be dangerous for this very reason.
Edit: As requested, I shall provide more details about my people, our body and our technology. Our wings are attached to our body at the hips, and we do have quite an impressive set of muscles at our lower back in order to operate them (You'll find a portrait of one of our youngsters at the end of this question). We can fly vertically, but our body can't - of course - just stay still; e.g. our torso leans forward if we are moving ahead, and so on. Wings can rise up to our shoulder level; this is necessary when needing good push or maneuvering. During normal flight they can be kept lower, but I don't think this could apply to the heat of combat.
Still, yes: our flight isn't sustained by muscular force and wingspan alone, at least not always. In our world there are some particular air currents - called Aer - that we are able to ride. Our innate sense allows us to understand and surf those currents according to our need. Aer-less flight is still possible, but it's extremely vexing for our body. Frankly, I hope that dirt-dwelling humans will never learn to build kites and such items to exploit aer-currents; the very idea disgusts me. But I suppose it could happen.
We are rather short compared to the average human (height going between 150 and 164 cm) and our bones are hollowed, making us more prone to suffer fractures.
Regarding our technology, I fear that the world "clan" as led you astray. We are more civilized than you thought: we have knowledge of most metals and can effectively forge them into shape. Our weapon of choice is the flechette that can be dropped on and fall into a straight line, or the light-crossbow when more precision is needed.
Of course, we can't carry infinite ammo with us; the common strategy is to have squires carrying up additional supplies or setting ammo stations on horses on the ground, usually reasonably far from the struggle. This way warriors can drop and reload efficiently, but as I said, this wouldn't work well with another of our species.
Our artisans give their best with tailoring. Being lightweight is paramount, as you can imagine; we mostly use cotton or silk, getting leather when a little more protection is necessary. We can craft more complex and sturdy types of armor - we don't lack the smiths to do that - but I fail to see how they could be used in flight; as someone noticed, our wings are mostly unprotected.
I understand there may not be a best weapon. My concerns about spears and swords lie in the human use of those tools, which often requires big slashes that would be troublesome mid-air. Again, though, I may be wrong. I have been trained in traditional combat—that is, aim-and-drop—and that's the very reason I need informed opinions on new tactics. Picture source: Gwendolyn from Atlus' Odin Sphere