Those are both decent. If we're allowed any song if it's just by a heavy metal band, I choose
Avenged Sevenfold - I Won't See You Tonight Part One
But, if the actual song has to be heavy metal, then I choose
Shattershpere - To No Avail
And so he said, "and there will be delicious cake", and with those words, I said, "I see what you did there..."