Of all the balls I have ever owned, here is a list of the ones that have cracked on me.
Ebonite Matrix
Hammer Blade (Ebonite made)
Columbia Super Beast (super flex cover)
Columbia Pulse (super flex cover)
Columbia Outrage (super flex cover)
AMF Firehawk (cracked across the bridge, that is a different type of crack in my mind)
From my experince, the Columbia flex covers and Ebonite covers in general are the most prone to cracking. I have never had a Storm, Rotogrip, Visionay, or Brunswick cover crack on me. And I would think that any ball that uses a think cover, most notabley Visionary, will have fewer occurances of cracking.
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Visionary Test Staff 07-08