Coucho,
By reading some of the reviews on this site, I would have to say the Rule. Some of the guys who actually know what they are doing, have said that the Rule has amazing recovery even on carrydown. I have seen it first hand as well. This ball is definitely for medium to medium-heavy conditions. I used one straight off the drill press. The backends were pretty clean but had plenty of head oil. I was sliding around 45 hitting the arrows at 20 with my breakpoint out at the 5 board and the ball went brooklyn. I think what will separate the Rule from the Bully, is that the Rule will clear the heads better than the Bully. For guys with alot of hand, the Rule will be the better choice. For guys with lower rev rates, I believe the Bully is the way to go, though you can't really go wrong with either ball. We just had a Track Clinic here in Atlanta with Cohen's Strike Zone and he sold 20 Rules. GRANTED, there were no Bullys to be sold, but with all the different styles that showed up (righties, lefties, crankers, tweeners, strokers), that there were that many Rules that were bought and drilled that weekend. Chuck Gardner, the Track Rep, could have went with an Animal or Phenom Unleashed as balls for heavier patterns. BUT.....the majority he suggested was the Rule. That has to account for something.
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If anyone out there is worried about the scores being too high, try duckpin!!