Don't choose, get both.
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Nick Smith ... A.K.A. Les Badderâ„¢
Brunswick -=- PBA 03-05
¡Viva la nación de Brunswick!

I think either ball will work, it's just a matter of what shot shape you want. From what I've seen, and I'm no expert, the AI will push further down the lane and offer more recovery. The UI will rev up much quicker and will provide strong and continuous arc. Just a note, you will probably have to shine the UI up, as dull it will want to burn at your feet. It's a super aggressive reactive ball. Both would make fine choices. Just figure out if you want more recovery or more control.
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I can't bowl 300, but I can bench 320 : )

I just got my UI today and will be using it tommorrow nite for league. It was a hard choice to make but earlier rolling balls work better for my game. But...u never know.

Arsenal as it now stands:

swamp = super carbide bomb
long/heavy = UI
med = hybrid dirty bomb (most people will agree here)
spare = white dot

my x factor ace and triple xtreme are now for sale only to someone in the local area, so i can avoid the shipping hassle. So if you live in the orange county or los angeles area hit me back.