On www.harekrishnalinks.com, I came across one article "Why to Chant Nityananda Gauranga?"

(http://nitaaiveda.com/Nityananda_Gauranga_Naam/Why_to_chant_Nityananda_Gauranga.htm)

Kindly tell us about the authenticity and accuracy of chanting another mantra other than Hare Krishna Hare Krishna Krishna Krishna Hare Hare, Hare Rama Hare Rama Rama Rama Hare Hare!