well.. for vai, exodus and most 80's stuff, I'd definitely pick the cold sweat
the holy diver can do that too, but it needs boosting for some extra edge and will never sound as raspy and aggressive as a ceramic
maybe this is also related to scooped feel that dheim mentioned
most people confuse amount of frequencies with the percepted distorted frequencies
the cold sweat, for example, does not have a lot of mids, but the mids are very present, cause they crunch a lot through distortion
the holy diver has a ton of mids, but they are totally clean and smooth, so they may not get as evident on distortion
this is exactly how I felt about my Framus Cobra
it had a ton of mids, but the mids didn't distort along of the other frequencies as much as I wanted (like a Soldano, with the open/clear midrange)
so I had it modded to crunch the hell out of the mids (like a Laney or Bogner)
it's as middy as before, but now the mids are way more evident, since they distort along with everything else
the tone got more dense and crunchy, instead of open (hollow) and clean