Depends what guitar you have, style you play and amp you use.
I've got an Alnico and a Ceramic Nailbomb in each of my Les Paul's (one main one backup) and I love them. They are very rich, organic and bark! But, the one thing I love about them is the clarity, esp under high gain. Also I'm primarily a rhythm player so its suits me down to the ground.
Haven't tried many of the others only the Aftermath and that was good just too middy and washy for me.