Astanga Yoga is better than Karma Yoga and Jnana Yoga is on the level of Astanga Yoga. But the Bhakti Yoga is the ultimate goal of all Yogas. In other words, Karma Yoga, Jnana Yoga, and Astanga Yoga by proper execution culminate in Bhakti Yoga. So far yogis who meditate on the Paramatma form of the Lord within their hearts, if they see Him in that way actually they become pure devotees, but if they do not perfect the process they may remain on the lower level of incomplete realization or Paramatma realization.
Letter to Jagadisa, 27 February, 1970