I think that Bare Knuckle does a poor (practically non-existent) job of explaining their neck humbucker, unfortunately. Those B/M/T charts that you see, for instance, are only for the bridge pickups.
The Nailbomb and Holydiver pickups are voiced very differently to me. The HD is warmer, fatter, smoother, and possibly more compressed to me. The demos I've seen of it under gain are fair representations. Single notes carry a ton of weight in the upper registers. It's fairly high output but not that aggressive to me.
The Nailbomb is possibly tighter. It might be less compressed, and it's definitely more aggressive. In fact for me it was too aggressive: kind of like a Vintage 30 speaker, it has some serious upper mids and presence that's always there and impossible to dial out. It always seemed to want to explode into nu-metal or something to me and I didn't find it very versatile. Other people love it.
I'm not familiar with the artists that you mentioned at all so the Nailbomb may be what you want, but it shouldn't be hard to decide between the two as they are voiced very differently.
Hope that helps.