"Please To Kill" is Kreator's best album, so if you have any interest in the band, direct it towards this one, on which you'll find the solid hybrid of speed and death metal which was emerging at this time.
"Painkiller" is essentially Priest playing European-styled speed metal, while still retaining all the clichéd silliness you'd expect from heavy metal. Still, it's one of their better albums, even if irrelevant to metal by the time of its release.