BCB covers a whole lot more boards than an Ultimate. It is almost a ball for opening up the lane, in its polished state, especially. The Ultimate, while it hooks plenty, is almost a control ball, BUT ONLY in comparison to the BCB. The Ultimate also hits harder. Unless you have some emotional need to cover all 40 boards (Lonce, you cover enough boards as it is already!), I'd have to suggest the Ultimate over the BCB, and from a cost perspective also. The BCB must flare 8-10" worth, with a 4" pin!
I believe BCB uses PK 18; Ultimate uses Activator PK 18.
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