Valve cover gasket material preference

So I have traditionally run Cork gaskets with black permatex on my valve covers. I definitely prefer a cast aluminum or some more rigid style of valve cover opposed to light mild steel or tin style. My question is what do you feel the best valve cover gaskets are for a solid flat tappet cam setup that might be disassembled on a more frequent rate. Keeping in mind I hate valve cover leaks with a passion and will not tolerate LOL.
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