A genuine question rises in Arjuna's mind. He has just witnessed Krishna's cosmic form — the Vishwarupa — and now stands at a crossroads. On one hand, there are devotees who worship Krishna's personal, manifest form with love and devotion. On the other, there are seekers who pursue the formless, imperishable Brahman — that which has no name, no shape, no qualities the mind can grasp. Which path, Arjuna wants to know, leads to the deeper understanding of yoga?
Think of it this way: a traveler stands at a fork in the road. Both paths lead to the same village, but one runs along the river and the other cuts through the hills. Arjuna is not challenging either route. He simply wants Krishna's guidance on which one suits the human traveler best.
This single question becomes the foundation of the entire twelfth chapter. Everything Krishna says from here — about devotion, practice, surrender, and the qualities of the ideal devotee — flows from this honest inquiry.