His name, Krishna Chaitanya, is all-auspicious for the world. Everything about Him -- His name, form and qualities -- is unparalleled.
This is very important verse from Chaitanya Charitamrita, Madhya Lila. Chapter 17, verse 113, spoken to Prakasananda Sarasvati by brahmana of Varanasi who saw Lord Gauranga Mahaprabhu. In this verse it is specifically said that His Name Shri Krishna Chaitanya or Gauranga is jagat mangala or all auspicious for the world. There are many auspicious things or practices in this world, but most auspicious thing in all worlds is Lord Gaurangas Holy Name.
Speaking about this unique characteristic of Lord Gauranga , brahmana is saying that everything about Lord Gauranga is unparalleled. It is significant to notice that he mentioned Lord Gaurangas Holy Name first because that is only way how we can actually get that auspiciousness. First there is chanting of Lords Holy Name, then meditating on His transcendental form etc. He is also saying that Name Gauranga is anupama or unparallel. By definition unparallel means something that can not be compare with anything else. Lord Gauranga Naam is Supreme Gods Name and can not be compared even with Krishna Naam. They are identical, but in the same moment Gaura Naam is anupama or unparallel because that is audarya or most merciful Name of God. Only devotees who got mercy of Lord Nityananda can understand this mystery of simultaneous equality and difference between Gaura and Krishna Naam. It is very hidden secret and it is so confidentional that we can see that even devotees of Vishnu or Krishna can not realize or understand that. Then what to say about various yogis, karmis or scholars?
In chanting Nityananda and Gauranga Mantrarajas there are no consideration of offences, while in chanting of Krishna Naam person should be very careful not to commit terrible ten offences. Chanting of those two most powerful Mantrarajas will transfer person to level of pure chanting of Krishna Nama and will bestow all perfection. That is why in this verse we found that word anupama is used.