I'd try both

I had the vhii set and the holy diver paired with a cold sweat, both in the same guitar (early 90's japanese Hurricane Les Paul copy)
the VHII is like a clean boosted PAF, with an uncompressed but loud woody tone, slightly recessed mids and a quite thumpy low end
the neck pickup is similar but a hair warmer and less bass heavy (I actually liked the neck model better installed in the bridge position, where it sounds a lot like a riff raff)
compared to the mule set in the same guitar, the vhII is generally louder, tighter and bassier, but still somewhat similar regarding the frequency distribution
they still retain that hollow acoustic-like sound of some PAF-based pups,
the holy diver is a completely different animal, with less bass, less top end and a ton of center mids
the diver is a lot more compressed and fatter in the mids, but it doesn't have that clean thump of the vhII
I liked it much better for leads and the pinch harmonics sounded huge
I kinda liked its clean tones better (although the vhii is cleaner)
I have no experience with the neck diver, but assuming it's supposed to be somewhat similar to the cold sweat, but less hot, I'd guess it has a brighter and middier tone than the vhII
not sure about the sustain, but both aren't really hot without some pedal help
personally, I like the holy diver better than the vhii, but really depends on what type of tone you're chasing