Want to share with you guys two possible ideas for my bugs and their origins.

One idea is that the bugs are living weapons of a long dead civilization. Of which they were mostly responsible for it's downfall, and they continue to fight a war that has long past. The Second idea is similar to the last, but with a sort of twist, they are living weapons, but not from a civilization, but the planet itself, it's alive and it's on a mad quest to wipe the galaxy clean of Galactic Civilization.

So which one sounds better for the setting?