for candies, solvent-based is the way to go. With any waterbase, the ink becomes too suscptible to UV fading. Which is why AA now has the "pigment based candy", which is not actually a candy at all. A "candy" paint, is, by definition, dye based. The AA stuff is just their transparent paints mixed with extra transparent base. It's ugly, doesn't look anything like a "candy", and still has problems with UV fading. Useless.

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One thing to be aware of, though, is that, if you haven't used solvent-based paints before, you're going to be needing a lot more ventilation, and, at least, an OV rated respirator. Even airbrushing in my full paint booth with over 100fpm of air moving through it, I still wear at least an OV rated respirator, if not my air-supplied respirator. I've heard of people using rigs they've made in their basements and spraying solvent-based paints, but there's no way in hell I'd do it. I even saw one idiot using 2k clear in his BATHROOM, thinking that a bathroom fan is going to move enough air to keep him safe (not to mention all the wonderful chemicals he's leaving for anyone else who lives there).
Anyway, my original point was this- waterbased paints and solvent based paints are two different animals. Yes, solvents spray nice, but you have the toxic fumes, flammability, having to clean your equipment with even nastier chemicals, personal safety equipment, etc, etc.
Comparing EFX to HoK isn't apples to oranges, it's more like nipples to elephants. Both have their place, and both work very well, but doing a complete "vs" scenario would have to take in a ton of different factors, well beyond tip dry and sprayability.