Depends on what you're planning to do with the bike.
The Powervision is a full featured tuner that will allow you to handle anything you do to the motor.
Meaning, if all you're ever going to do is air cleaner and exhaust, you're paying for more than you need with the PV, and the FP3 will be enough.
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2015 FLTRXS, SE Ventilator A/C, V&H Pro Pipe, S&S/Crane Chris Rivas Rocket 574 cams, Chris Rivas V-Twin dyno tune: 103 hp, 108 tq.