Doctrinally, they had disagreements in the beginning; Wasil is said to have converted Amr to his Mu'tazilite opinion in a long discussion. More than Wasil, Amr had belonged to the circle of close disciples around Hasan al-Basri, whose Tafsir he transmitted.
In terms of belief systems, they had initial differences; Wasil is said to have persuaded Amr of his Mu'tazilite perspective during a lengthy discussion. More than Wasil, Amr was associated with the circle of close disciples around Hasan al-Basri, who taught him Tafsir.