mahanila

ok, putting bhagavad gita aside, lets look at what others sastra's say... In the Atharva Veda (Gopala-tapani Upanishad 1.24) it is said, yo brahmanam vidadhati purvam yo vai vedams ca gapayati sma krishnah: “It was Krishna who in the beginning instructed Brahma in Vedic knowledge and who disseminated Vedic knowledge in the past.” Then again the Narayana Upanishad (1) says, atha purusho ha vai narayano ’kamayata prajah srjeyeti: “Then the Supreme Personality Narayana desired to create living entities.” The Upanishad continues, narayanad brahma jayate, narayanad prajapatih prajayate, narayanad indro jayate, narayanad astau vasavo jayante, narayanad ekadasa rudra jayante, narayanad dvadasadityah: “From Narayana, Brahma is born, and from Narayana the patriarchs are also born. From Narayana, Indra is born, from Narayana the eight Vasus are born, from Narayana the eleven Rudras are born, from Narayana the twelve Adityas are born.” This Narayana is an expansion of Krishna. It is said in the same Vedas, brahmanyo devaki-putrah: “The son of Devaki, Krishna, is the Supreme Personality.” (Narayana Upanishad 4) Then it is said, eko vai narayana asin na brahma na isano napo nagni-samau neme dyav-aprithivi na nakshatrani na suryah: “In the beginning of the creation there was only the Supreme Personality Narayana. There was no Brahma, no Shiva, no water, no fire, no moon, no stars in the sky, no sun.” (Maha Upanishad 1) In the Maha Upanishad it is also said that Lord Shiva was born from the forehead of the Supreme Lord. Thus the Vedas say that it is the Supreme Lord, the creator of Brahma and Shiva, who is to be worshiped. narayanah paro devas tasmaj jatas caturmukhah tasmad rudro ’bhavad devah sa ca sarva-jnatam gatah “Narayana is the Supreme Personality of Godhead, and from Him Brahma was born, from whom Shiva was born.” ISVARAH PARAMAH KRSNA SAC-CID-ANANDA-VIGRAHAH ANADIR ADIR GOVINDAH SARVAH-KARANAH-KARANAM Krsna who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.-Brahma Samhita

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Unintelligent men, who do not know Me perfectly, think that I, The Supreme Personality of Godhead, Krsna, was impersonal before and have now assumed this personality. Due to their small knowledge, they do not know My higher nature, which is imperishable and supreme. - Bhagavad Gita 7.24 Men of small intelligence worship the demigods, and their fruits are limited and temporary. Those who worship the demigods go to the planets of the demigods, but My devotees ultimately reach My supreme planet. - Bhagavad Gita 7.23

^how do you expect to develop love for God when you speak in such a way? "One should think oneself to be more humble than the blade of grass, more tolerant than the tree, devoid of all sense of false prestige, and ready to offer all respect to others. In such a state of mind one can chant the Holy Name of the Lord constantly." - Lord Caitanya

Either path you choose will lead to the same end, but I would advise you to go with ISKCON It's 'requirements' are more strict, but that is a good thing. More austerity means more purification which means you will achieve the goal of all religions quicker. The more selfless sacrifice you perform for the sake of developing your love for Krsna, the more you captures Krsna's heart.