While I have been using a Hornet lately and have seen a Neptune or two, both will clear the heads easily on light oil patterns. So they are both very usable on light oil. The thing to be aware of is that both use strong coverstocks (no matter that the Hornet is harder) and as the lanes get drier and drier, these balls become hook MONSTERS.

I would have drilled my Hornet much milder, if I had known that. Mine is drilled, roughly 4.5" x 5.5", with the pin in the ring finger, approx 2.5" above the midline.

Higher and milder drills also let the Neptune remain usable as the lanes dry up. With strong drills plus light oil the Neptune has the potential to hook a LOT also.

My Blue Green Centaur's coverstock is milder than either of these balls and the cover is much more adjustable. I'd prefer it over the other two for drier conditions, UNLESS one has more ball speed than I do. My speed is only average at best.
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"None are so blind as those who will not see."

I think it might be a good idea to drill it to be versatile as well, especially after reading your replies.  I'm beginning to understand that sometimes the lane takes your comfort zone shot away from you, even on a THS.  

Usually I like to drill bowling balls so that I can use different hand positions based on what the lanes are doing.  Most of the time I use what I would consider a tweener hand position  and I play a small swing shot.  I know how to straighten the ball out with speed and a flatter hand or "send it and bend it" with a slower speed and more tilt. If they get too fried, I have a Lane #1 XXXL that I use for spares that I can use.  

I'm looking for something between my T Road Pearl and my XXXL, I own a Venus, but I drilled it pin low because I wasn't sure what it was going to do, the result was a similar reaction to about 5-6 other balls I own.  I'm thinking the Hornet will fit the bill with the right drill and surface.  I've been wanting to try a Legends/LM ball for a while now, and I think this one will fit into my arsenal quite nicely.

Don't forget there is the straight flush out there, great ball on drier conditions, it does move some, and gives you a great weak ball option.  It acts like plastic on oil, but on the dry stuff, it comes to life without being the hook monster we are trying to avoid.