I'm no expert on these but my research is that SV-8 is a 2.4 watt hub. It works well with the modern lights but since it puts out less power you have to be at a higher speed to charge things like a GPS or iPhone. The PV-8 is a 3 watt dyno and is a better match for charging devices. The advantage of the SV-8 is that it's lighter weight and has less resistance so it's a better for randonneuring and such. The PV-8 would be what I would choose for touring where you need to recharge your phone and things and you are traveling at a slower speed.
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