Better Off Dead and In War And Pieces are by far the best albums they ever did - everyone bums Agent Orange, but I never got it's full appeal. Their 2006 self-titled is stellar too, and it may be worth checking out Tapping the Vein, Get What You Deserve and Masquerade In Blood too.
Sodom never did a bad album. GWYD, MiB and 'Til Death Do Us Part were much more punk/crossover in places but they're still excellent albums. I'd say the only one that's not very good is The Final Sign of Evil, which was essentially what their debut EP was supposed to be - it's just not that good.