The Diluceo is my favorite of any speaker we have offered or worked on, including custom designs, with the exception of the Alphas.
The Alphas are just a lot more "real", and a lot of fun too.
The Alphas are kind of in their own league.
The Diluceo is more accurate, is better suited for smaller rooms, sounds as natural, and has better resolution and detail.
The Alphas are life sized, and have impact that grabs you by the balls and involves you.
It might be one of those situations that you have to experience to really get.