I'm sure you know this Chris, but I'll throw it out there anyways (not that I'm an expert mind you). The PLB's can only be activated manually and typically worn by one person onboard the vessel where the EPIRB is generally mounted to the boat and activated when submersed in water.
That said, a lot of guys I know have gone to the PLB's because of cost. And any signal is better than none at all. I don't think you can go wrong with either one.
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