Srila Prabhupada once announced, "The chanting of Sri Caitanya Mahaprabhu's name is more essential than the chanting of the Hare Krishna maha-mantra." One smart devotee then inquired whether we should therefore chant rounds of the Panca-tattva mantra to which Srila Prabhupada replied, "No — because Lord Caitanya's instruction was to chant Hare Krishna."
Hare Krishna Hare Krishna
Krishna Krishna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare
hare krishna hare krishna
krishna krishna hare hare
hare rama hare rama
rama rama hare hare
iti sodasakam namnam
kali-kalmasa-nasanam
natah parataropayah
sarva-vedesu drsyate
"The sixteen words of the Hare Krishna mantra are especially meant for counteracting the contaminating influence of the age of Kali. After searching through all the Vedic literature, one cannot find a better method."