The looks of a ball do not really turn me on... rather off, when it looks very daring. But in fact I like balls which help me recognize what tha ball is doing, when and how it breaks and how fast it revs.
Therefore, balls like the Inferno with 2 high contrast color blotches are very nice for this purpose (do not own one, just an opinion), as is a high contrast balance hole on the PAP. I even experimented with white tape set into the inner rim of my balls' X-holes, and this is quite revealing - even if the ball colour does not tell you much about the ball's reaction itself.
Another option I used for training and videotaping is to stick about 6" of 1" wide painter's masking tape between PAP and my ring finger hole, plus another 3" piece of tape crosswise on the PAP, when there was no balance hole available. The tape will not make contact with the lane, but you can easily spot what the ball is doing and make videotape analysis on your style, ball recation and on hand revs/RPM.
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DizzyFugu --- Reporting from Germany
"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe