Audible Illusions 3A or Modwright SWL9.0Signature?

These two pre-amps are too close to call. Both have received excellent reviews. However, from the aspect of dynamics, accuracy and especially MUSICALITY, which pre-amp might have the edge???.... Also, though it is almost twice as expensive as the above units, how does the Rowland's Concerto pre-amp rate?? There are hardly any reviews of the unit.