The Abraxas is basically a Mule on steroids, and is a bit more middy, the Mule with a bit brighter a tone. As I've said before here I'm a big fan of underpowered pickups being driven by a good amp, there's nothing that beats that and I feel like the Mule is basically the definition of that. It's an extremely versatile pickup, as the name implies (I'm guessing it wasn't a coincidence 8)) as well.