Differences between meditation and bhakti
Dhyana, meditation, is just one way to practice bhakti, devotional service to the Supreme Person.
In the Bhagavad-gita, Krishna explains to Arjuna the whole process of meditation, especially in the sixth chapter. He concludes the chapter by saying that of all yogis, the one who is always thinking of Krishna and worshiping Him with great faith is the highest of all. The most direct and practical means of thinking of Krishna in the current day and age is to chant Hare Krishna.