Goku is the main character of Dragon Ball Z and also the strongest Saiyan for most of the series. There have been times when his archrival, Vegeta, has gone past him or equaled him, but Goku is always deemed stronger in the end. During the Android Saga, when Vegeta begins his battle with Android 19, one of the Z Fighters asks Piccolo whether Vegeta is stronger than Goku, and Piccolo answers that he very well may be. But Goku was suffering from the heart virus at that time and soon rose to the occasion and became stronger again. Poor Vegeta.