Originally posted by: ananyacool
This excerpt is from ISCKON texts where it differentiates between Vishnu and Krishna , also says Krishna is supreme to Vishnu "Krishna in Vrindavan is like God at home, while Krishna, as Vishnu in various Vaikuntha planets, is like God at office. A person at home is most comfortable and relaxed and has intimate loving dealings with his family members, while at office he has very formal dealings with his associates. Similarly in Vrindavan, all the Vrajavasis have very intimate dealings with Krishna in sakhya (friendship), vatsalya (parental) or madhurya (conjugal) rasas. No one there is aware of Krishna's supreme position as God that usually results in very formal and reverential dealings. In the Vaikuntha planets, however, all the residents are always aware of Vishnu's supreme position as the controller and maintainer of the whole creation. Therefore, all their dealings with Him?including those of sakhya, vatsalya and madhurya are tinged with the feelings of awe and reverence. So, from an impartial study we can see that Krishna's pastimes are more sweet and enchanting than those of Vishnu. In that sense, Krishna is superior to Vishnu.
Krishna also has four additional unique qualities not found in Vishnu. Srila Prabhupada explains them in The Nectar of Devotion:
1.Lila-madhuri?He is the performer of wonderful varieties of pastimes (especially His childhood pastimes).
2.Bhakta-madhuri?He is surrounded by devotees endowed with wonderful love of Godhead.
3.Venu-madhuri?He can attract all living entities all over the universes by playing on His flute.
4.Rupa-madhuri?He has a wonderful excellence of beauty which cannot be rivaled anywhere in the creation."
Brahma-samhita compares Krishna to a candle from which several other candles are lit. These candles are compared to Lord Vishnu and the various incarnations. Diparcir eva hi dasantaram abhyupetya . . . . (Bs. 5.46) Although all candles have the same potency, the original candle still retains its uniqueness. Krishna is like that original candle, the source of all the incarnations.
After describing the various incarnations of the Lord, Suta Gosvami quotes the following verse (Bhag. 1.3.28):
ete camas kala pumsah
krsnas tu bhagavan svayam
indrari vyakulam lokam
mrdayanti yuge yuge
"All the incarnations are either plenary portions or portions of the plenary portions of the Lord but Lord Sri Krishna is the original Personality of Godhead. All of them appear on planets whenever there is a disturbance created by the atheists. The Lord incarnates to protect the theists."
(as it is from ISCKON texts)
Graham Scheweig in his thesis "Krishna, the intimate diety " proposes a model ( Pic given below) says Krishna is supreme to Vishnu. Pic within Creative common 3.0
Again , it depends on personal beliefs ; which scriptures we refer to
Also I don't support anybody's views, just posted whatever I'd read.