How bhakti-yoga is the best yoga

Bhakti-yoga, devotional service, is the basic principle of all systems of philosophy; all philosophy which does not aim for devotional service to the Lord is considered merely mental speculation. But of course bhakti-yoga with no philosophical basis is more or less sentiment. There are two classes of men. Some consider themselves intellectually advanced and simply speculate and meditate, and others are sentimental and have no philosophical basis for their propositions. Neither of these can achieve the highest goal of life-or, if they do, it will take them many, many years. Vedic literature therefore suggests that there are three elements-namely the Supreme Lord, the living entity and their eternal relationship-and the goal of life is to follow the principles of bhakti, or devotional service, and ultimately attain to the planet of the Supreme Lord in full devotion and love as an eternal servitor of the Lord.

Srimad-Bhagavatam 3.29.1 purport