For me so far has been QV back in '06. Since than I have not had as good results from any other gear. I would have to say that Karachi Sustanon has got close to QV thought.
Those Russian susts were "da bomb"! Once took them with Mexican Deca pre-loads and Polish Metanabol (d-Bol), and grew like crazy! That's going back about 15-16 years ago.
Best gear up to date has to be Alpha Pharma and British Dragon (.eu stuff not the WP shit) followed by ProChem labs. That's what I have tried and liked very much. Alpha pharma stuff though is terribly expensive.