The Radar and Action Packed have very similar covers, but the main difference is in core design. They both have similar Differentials, but the RG is lower in the Action Packed vs the Radar. This will cause the Action Packed to Roll sooner compared to the Radar and probably have slightly less backend compared to the Radar. Can't go wrong with a Radar, if you read all the success this ball has had in the past, it shows the ball is a winner, and fits all bowlers styles very well. Hope this helps.
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Nathan Michalowski
AMF300 PBA Regional Staff
Vise-Grip Pro Staff
OnTheFly@aol.com