With Vasudeva

Physically: He has become more of a strong, and normal man. He has aged much.
Mentally: He is more of a listener now and has become one with the river.
Spiritually: He has become more spiritual than ever thanks to Vasudeva.
Socially: He is only with Vasudeva, and later his son as well. he is well known as a man of wisdom and greta teaching.

But he learned more from the river than he could ever learn from Vasudeva.

This quote tells us that Siddhartha has learned much from not only Vasudeva, but also the Buddha and others that have affected his life. This doesn't matter now though because he sees the river as his greatest teacher, and more wise than all the other teachers in his life.