Best Heavy Metal Band of all time. (Do people still listen to metal?)

Iron Maiden was my introduction to metal and that was in the 80's. Since then I've become a fan of several. No way to pick a favorite but Sabbath is very high on the list.
The fact that Iron Maiden and Judas Priest aren't in the rock and roll HOF and grandmaster flash and snoop dog are is
a crime. WTH are these voters thinking? This no knock against Flash or the Dog,but they belong in the rock and roll
HOF as much as George Jones and Waylon Jennings