Are Erine Ball strings good for Metal Music?

Not unless they are part of a special custom series.

good string for metal are usually Elixer's.

I have Elixer NanoWebs on my Epiphone SG, and ESP Eclipse and i
get amazing pinch harmonics, and they are coated so they are good for faster glossy tones and sweep picking.

ernie ball strings though are awsome slash used them and slash is the man on guitar so yeah