this argument flairs because its goal dependent.
That said. I do personally believe that diet is king, but training is damn important too. when I say diet is king, i dont mean you have to be micromanaging your meals. I sure as hell didnt this offseason, but i did make sure i inhaled as much as i could hold. And i tried not to get past a certain point, due to the knowledge that i was gonna have to inevitably cut.