According to Bowling this month magazine the neptune is much more tame.  The extremely low flare and mild coverstock give it more length and less overall hook than the hornet.
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Power Machine-Inertia-Black Widow-Mystic-Desert Heat-Neptune-Plastic

Have thrown both. The Neptune gets thru the heads a lot cleaner. The Hornet tends to read more midlane....but, I find the Hornet easier to control on the backend. You'd have to get the perfect drilling for your style on the Neptune, to control the snap it gives on the backend.
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Duct tape is like 'The Force'. It has a light side and a dark side, but it still holds the universe together.

Some days you're the bug; some days you're the windshield.