I would expect heat treated to be harder and more corrosion resistant.
Zinc coated nuts might corrode quicker than chrome, but then again might not. Depends on the chrome/zinc quality.
If you want the best quality lug nuts available I'd have to suggest McGard.
I have a pic somewhere of an old chrome lug nut vs a McGard nut and the cheaper nut is rusty and has the chrome flaked off it.
When I bought my current McGard nuts I bought a pack of 100 from rockauto and batched the extras up. Gave one set to a guy who used his Jeep for charity work, sold the others on ebay to make mine essentially free.
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