Usha, to answer your question from Narayana sooktam:
Sa bhrama, sa siva, sa hari, s'endra s'okshara, parama swarat.
Tvam bhrama Tvam Vishnustvamrudrastvamindrastvamagnistvamvayustvamsuryastvam chandrama tvam bhrama: boorbuva: svarOM.
It really doesn't matter as long as you pick one and place the complete faith.
Krishna, arguably is the most charismatic of them all - "Karshati ithi Krishnaha".
He gave the Bhagavat Gita. He graced the Gopikas (gender no bar) and Yadhavas (caste no bar) who knew no rituals/agamas of worshipping but love and Bhakti. He is the most recent Vishnu Avataram. His leelas are bountless. He is the Supreme God, if you believe.