Answer by Swami Gaurangapada:
"GAURAANGA" IS MOST PRINCIPAL AMONG THE MOST PRINCIPAL NAMES OF LORD KRISHNA.
(I) In the Brhad-visnu-sahasranama-stotra, Uttara-khanda, Padma Purana (72.335) it is said:
rama rameti rameti, rame rame manorame;
sahasra-namabhis tulyam, rama-nama varanane.
Lord Siva addressed his wife, Durga: "O Varanana (lovely-faced woman), I chant the holy name of Rama, Rama, Rama and thus constantly enjoy this beautiful sound. This holy name of Ramacandra is equal to one thousand holy names of Lord Vishnu (Vishnu-sahasra-nama-stotram)."
(II) In the Padma Purana it its mentioned:
visnor ekaika namapi, sarva vedadhikam matam
tadrk nama sahasrena, rama nama samasmrtam
"Each Name of Lord Vishnu is greater and more potent than the entire Vedas combined together, and Lord Rama's Name alone is more superior that a thousand Names of Lord Vishnu."
(III) In the Brahmanda Purana it is stated:
sahasra-namnam punyanam, trir-avrttya tu yat phalam;
ekavrttya tu krishnasya, namaikam tat prayacchati.
"And the pious results (punya) achieved by chanting the thousand holy names of Vishnu (Vishnu-sahasra-nama-stotram) three times or the Holy Name of Rama thrice can be attained by only one utterance of the Holy Name of Krishna."
(IV) Prabhasa Khanda of Padma Purana states:
namnam mukhyataram nama, krishnakhyam me parantapa;
prayascittam asesenam papanam mocakam param.
"O Arjuna, the Holy of Krishna is the most principal (mukhyataram) among all Names of God. One can atone for unlimited sinful deeds by chanting the Name of Krishna which is the supreme destroyer of all sins."
(V) Finally in the Brahma-Rahasya it is stated:
krishna-caitanyeti nama, mukhyan mukhyatamam prabhoh;
helaya sakrd uccarya, sarva-nama-phalam labhet.
"The Holy Name Krishna Chaitanya or Gauranga is the topmost or the most principal (mukhyan) even among all the important primary and most principal (mukhyatamam) Holy Names of the Lord Krishna. By chanting this name just once, a person attains the spiritual results (punya) of chanting all the other holy names of the Lord."
So from the above five very important verses we can easily come to the following conclusion:
Secondary Names of God like Brahma, Paramatma, Shrishtikarta etc. take us only to the heavenly planets or maximum can grant us liberation or mukti. But the following Primary Names of God can elevate the soul to the Vaikuntha planets in the spiritual world:
Vishnu's Name = Principal Name of God more than all the Vedas combined together
Rama's Name = More Principal Name (Mukhya) of God =1000 Names of Vishnu
Krishna's Name = Most Principal Name (Mukhyataram) of God = 3 Names of Rama or 3000 Names of Vishnu
Gauranga's Name = Most Principal (Mukhyan) among the Most Principal Names (Mukhyatamam) of Krishna = Sum Total of all the result achieved by chanting the Names of Krishna, Rama and Vishnu
Let's conclude by the divine words of Shrila Jagadananda Pandita in his great book Prema-vivarta, confirming the above conclusion:
gaura ye visala nama sei nama gau;
anya saba nama-mahatmya sei name pau.
"The most powerful names of God are the names of the most merciful incarnation of God, who is known as Lord Gauranga. The glories and power of all the other names of God are completely present in the Names of Lord Shri Gauranga Mahaprabhu and thus They should be constantly chanted."