I have both. The Ultimate, even in the highly polished condition that I keep it in, will roll a bit sooner and be more arch shaped than the AI. The AI goes just a touch longer and gives more traditional pearl movement on the backend. If you're looking for more snap, check out the green pin Zone Classic. For me, it goes a bit further down the lane and is more snappy than the AI.
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I can't bowl 300, but I can bench 345 : )