The Best Among You in Conduct.

disposition? personality? the way you treat others and act? etc?

How you act and treat others.

maybe you could look up the exact hadith and put it up here. then we could discuss.

`Abdullah bin `Amr bin Al-`as (May Allah be pleased with them) reported: Messenger of Allah (PBUH) did not indulge in loose talk nor did he like to listen to it. He used to say, "The best of you is the best among you in conduct.''
[Al-Bukhari and Muslim].

Commentary: This Hadith, apart from describing the refined behaviour and sublime morality of Messenger of Allah (PBUH), tells us that a person with the highest moral sense is in fact the best among people.

Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (PBUH) was asked about the deed which will be foremost to lead a man to Jannah. He replied, "Fear of Allah and the good conduct.'' Then he was asked about indulgence which will admit a man to Hell (Fire) and he answered, "The tongue and the genitals.''
[At-Tirmidhi].

Commentary: This is also a very comprehensive Hadith. Fear of Allah really links up a man to Him, and moral refinement prevents him from falling short of his duties to people. To be sure, adherence to this two-fold practice will cause the entry of a lot of people to Jannah. Many a man, on the other hand, has a long, sharp and dangerous tongue and this causes him to pour out heretic utterances and indulge in backbiting, slandering and abusive and nonsensical talk. All this activity leads to Hell. As for genitals, an unwary and unrestrained attitude incites one to indulge in immoral pursuits. In both these cases countless people will be led into Hell. For this reason it is imperative for everybody to develop Taqwa (consciousness of Allah / fear of Allah ) and refined behaviour and shun the wickedness of tongue and genitals so that his life in the Hereafter may not be ruined.

source