I honestly can't name 10 "metal" bands. I could probably name a few dozen that thought they were but weren't. But actual metal bands? Dio, Iron Maiden, Black Sabbath, Ac/Dc, (See? I'm already running out of gas)...........yeah, that's about it. Bands like Judas Priest, Warrant, Skid Row, etc were all posers and wannabes. And don't even think about mentioning Poison and Motley Crue. Between the two of them, they are 90% of why metal sucks and why those who came after weren't metal.
As far as grunge, all I have to mention is Pearl Jam and Soungarden. These two put out more quality rock and roll than all the bands listed above, combined.