In the latter day Taint releases, there was a shift where the vocals were brought much more to the forefront. Whereas on the older material, he only used vocals sparsely and when they were there, they tended to be a lot more buried in the overall mix. Personally, I always felt him making the vocals more prominent really elevated the material. If you want his best vocals I'd start with those later releases, Misogynist Lust, Vice, Dau ghter, and Sex Sick especially (most have already been mentioned).