I'll wade in with my opinions as that's the norm for me.

For my style and technique and the way I have laid out the Char Ex stacked vs. Solid Glad pin to PAP same number but CG shifted slightly more to the right than the Char.  So layouts not exactly the same.  For me the Char Ex has a little more movement on the backend....flares slightly more....BUT they ae both smmoooooth of the spot in a roll to the the 1-3.

I don't have a Pearl Glad but most say it's a smooooth ball now my Crimson Ex is pin above bridge 5 1/4" pin to PAP CG shifted right off grip center.  This ball is anything but smooth.  It's left turn Clyde off the spot.  Not as muc left turn as a similarily drilled Greenie but dang close......G-3 Gryphon is about the same kick your ball left in it.  Of course, the patterns amplify this skid-snap.  From what I hear the Pearl Glad is not as much skid snap as the Crimson Ex was....these are just my experiences some may have others and I am no wind-up in the 325 rpm range medium speed tweener 4 7/8" over and 0.  

Like to hear what others have experienced.  BTW....I think all 4 balls are fine equipment and have a place for most bowlers.
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Scott