It's a pity that as the sound quality went up, song quality went down - they were just too conventional-sounding by Euthanasia, too much in the verse-chorus-verse-chorus mode. Rust In Peace strikes a happy medium, in terms of great tracks and also markedly improved production on previous albums, but I still think Peace Sells and SFSGSW showcase the best of the band's music: they were still proper thrash back then, rawer, faster and heavier than anything after Rust In Peace - some of the guitar work + arrangements on SFSFSW particularly, is unreal! But if it's purely production values at stake - then yeah, Countdown and Euthanasia have it.