they became really popular after the release of the highway to hell album, back in black was their peak though
ACDC
Both very popular, but ACDC were much more popular for a longer period of time. So ACDC is more popular than Judas Priest.
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Depends on what country you are talking about. UK.. Ramones. US.. ACDC. Both are equally popular in their respective countries.
Both bands are very popular, but ACDC reached the masses more than Megadeth so ACDC wins this one.
Obviously it's ACDC, they've been playing since 1970 and they still rock!!
Australia