Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
This world is under the control of God. God, in turn is under the control of Mantra(Divine name/word). Vedantis worship God in "Abheda Bhava"(considering themselves as one with God), while Bhaktas worship God in "Bheda Bhava"(considering themselves as separate from God).
We see that Bhakthi or devotion is best done with Lord Vishnu. Since the path of Bhakthi has Smaranam(Constant remembrance of Lord), Shravanam(Constantly hearing about Lord) and Keerthanam(Singing the names and glories of the Lord) as its major foundations, we require a deity who has beauty, who is easily approachable, who has an enjoyable legend of sports and deeds to capture our heart naturally. All this is fully manifested with SriHari. Hence the domain of bhakthi is dominated by Hari bhakthas.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
Prahlad says, "I am not selfish. I will not feel elated, 'Oh! Lord is calling me,' and follow you. Crores of people are slogging in 'samsara'. What is the way out ('gati') for all of them? I may come to your place along with all of them. I am not one to sit on your lap just because you have called me, and make merry. I will come only along with all (the others)."