It's close between The Great Milenko and The Amazing Jeckel Brothers, but I think Milenko takes it as that Beck track reworking on TAJB just doesn't sit right.
Milenko's the perfect match between their angriest lyrics and Mike E Clark finding his own as a producer.
Best track? Tough call, the rock influence on Piggy Pie has aged badly, whilst the slapstick nature of some of their later releases taints tracks like Hokus Pokus. For me, it's probably the morbid ballad Under The Moon, almost a sister track to Eminem's Stan of a similar period though its lyrics notably more explicit.