Which mantra is best for Lord Vishnu?

Which mantra is best for Lord Vishnu? THERE ARE MANY MANTRA BUT YOU CAN'T CHANT VEDIC MANTRA WITHOUT GURU BUT ONE MANTRA IS BEST OF ALL IS SARNAGATI(COMPLETE SURRENDER), AS THIS IS TOLD BY SRI BHAGWAAN HIMSELF IN BHAGWAT GEETA :- सर्वधर्मान्परित्यज्य मामेकं शरणं व्रज | अहं त्वां सर्वपापेभ्यो मोक्षयिष्यामि मा शुच: || Abandon all varieties of dharmas and simply surrender unto Me alone. I shall liberate you from all sinful reactions; do not fear. THIS IS THE BEST FOR ALL WHICH IS TOLD BY SRI VISHNU HIMSELF IN GEETA. NAMO LAXMINARAYANA