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I've used both XL jets and XL slipstream fins. The slips are about 25% lighter (less than 1# difference v. jets for a pair) on land, though they feel significantly lighter. They are also stiffer and hence bend less when frog kicking. Myy air consumption, trust and maneuverability wwere about the same on both jets and slips. The pockets on them are also the same, except 1/2" deeper on the slips (I think the monoprene is thinner than the rubber SP uses), both are uncomfortable. My theory is that people just find them more comfortable because the fins themselves are lighter to kick. I don't think one is better than the other beyond personal preference. Do you want heavy, negatively buoyant fins or lighter, about neutrally buoyant fins?
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