I've got both with similar drillings. The FP has a fourth hole 6.75" from the cg through 45 degrees and the OI has the hole about an inch closer to my PAP along the PAL. The OI is much stronger. In fact, those two balls allow for about a five game block of play near the same area with similar reaction shapes. If the oil pattern is shorter or less volume, the FP would, obviously, be the preferred pill. Both balls are great.
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The task ahead of us is never as great as the power behind us.
Me MTIXE
Charter member of the Cartel for Eradication of Avenging Unicorns