Although I don't think scale play a major part in sounding like a certain band or person, I believe Black Sabbath used the Minor Pentatonic and Blues (which are extremely similar) scales a lot.
A great scale widely used in metal is Harmonic Minor. If you're tuned in standard try E Harmonic minor. Used by a lot of bands like In Flames, At the Gates, The Black Dahlia Murder, and many many others.