The contrast here, disciple of Jesus and disciples of Moses, chiefly concerns the Lord's supposed violation of the Sabbath law given by Moses. You are a disciple of this violator of the Sabbath law, while we are disciples of him through whom that law was given to us.
From this reproach one should not conclude that the healed man already belonged to the Lord's disciples in the proper sense. Nor should this be concluded from his mocking question to the Pharisees, whether they too already wished to be His disciples.
He was not yet a disciple and follower of the Lord; compare Jn 9:35 and following. But judging by his statements, he was ready to become one. He could know that his Healer had disciples (Jn 9:2). Therefore he asked the Pharisees whether they too wished to join the company of these disciples. They then repeated, in reference to him, the word he had used.
That truth was on their side in this case, and that they were orthodox disciples rather than the former blind man, they prove, in their opinion, irrefutably. Moses, their teacher, was the greatest of the prophets who received immediate revelation from God.
He was therefore unquestionably God's messenger, with whom alone God spoke mouth to mouth. He was thus an immediate witness of divine truth. "But this Man," whom they contemptuously do not even name alongside Moses, "we do not know where He is from." That is, we do not know by whom He was sent, nor by whom He is authorized to teach and act; compare Jn 8:14.