X2! The Remflex will take up any inconsistencies in the flange (not uncommon with some stainless headers), where the Cometics have very little give, and require a much flatter surface to seal correctly. Because they compress and rebound so much, they don't require retorqueing either.

There are quite a few different thicknesses on the cometics, I don't know if the thicker ones seal any better? The cometic standard bbc, and Merc ones are available through Summit, etc.

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Remflex exhaust gaskets, we used them especially for some of those GIL / Merc alum exhaust manifolds that has flanged warped overtime when the end user does not want to spend the money for new Manifolds or get them shaved. They seal pretty darn well. I like them as well. Their line of gaskets has grown a lot this current year, it seems as it has doubled. .