This feels like an apples vs oranges comparison. Libraries tend to be more focused and single purpose (e.g., provide an interface for technology X).

When you begin composing libraries together to do a multitude of things you tend to end up with a defacto framework whether you call it that or not.

Frankly, I'd rather use a framework that has been battle tasted and hardened through open source and is well documented instead of one that is incomplete and lacks conventions built in-house.