why Krishna and not others?

Another day, someone asked why Krishna and why not Jesus?

We all have opinions. That makes us who we are. Between different opinions, an expert's opinion is given weight. Between experts, the expert with extensive knowledge and experience is given weight. Like this we can deduce logically that commonly, when opinions are sought, the person with the most knowledge and experience weighs out others' opinions. If we also know the amount of mistakes one commits then that can still filter out opinions. Above all this, if we know the person really cares about me and my well-being then that opinion still stands high.

So anyone's opinion who has a combination of all three (extent of knowledge,lack of error and well-being) to a high degree can be accepted. In that regard, Krishna is faultless (perfect), all-knowing (omniscient) and friend of all beings. Above that, He is also the person who owns everything in this cosmos. Therefore, we accept Krishna's opinion versus another say like Jesus or someone else.

Therefore, O Lord, feeling weary of material life and tormented by its distresses, I now surrender unto You because You are the perfect master. You are the unlimited, all-knowing Supreme Personality of Godhead, whose spiritual abode in Vaikuṇṭha is free from all disturbances. In fact, You are known as Nārāyaṇa, the true friend of all living beings. - Uddhava to Krishna - SB 11.7.18

Hare Krishna