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H13 is a nice vacuum hardened steel, I'm assuming the reason why they don't need to be retorqued a lot is due H13 being pretty well heat resistant. If the price was the same as new age 625 I would probably choose the H13 still, the only real advantage new age 625 has is that it's more resistant to to corrosion. It's still hard to compare them since we don't know the exact specifics for the heat treatment being used on either stud. The biggest questions for my geeky self would be what temperature were they quenched and and what were they tempered at?
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