All three men are accomplished warriors. Banquo and Macbeth are also good friends, and both are tempted by the witches' prophecy. However, Macbeth shows his difference from both men in his overly ambitious nature. He wants to be king, the one in charge, while the other two men are content to be followers.
Macbeth shows the grip of his ambition in act 1, scene 3, when the witches' prophecy about his becoming Thane of Cawdor becomes true. His mind leaps to the idea of realizing the rest of the prophecy by murdering Duncan:
If good, why do I yield to that suggestion
Whose horrid image doth unfix my hair
And make my seated heart knock at my ribs,
Against the use of nature?
In the same scene, Banquo is tempted by the idea of his descendants becoming kings of Scotland but not to the point of taking matters into his own hands. He also believes Macbeth should let his new position as Thane of Cawdor settle in, comparing it to getting used to new clothes, a quote that can be found shortly after the Macbeth quote above.
In act 4, scene 3, Macduff shows his loyalty to Duncan, putting the needs of Scotland ahead of his own ambitions or loyalty to an illegitimate king. This shows his difference from Macbeth. You can find quotes to support that in his dialogue in the scene with Malcolm.
Of course, Macbeth is loyal to Duncan until his own desire for power becomes too great, so we have to hope Macduff is a better person. We also must hope that as king Malcolm will be wiser than his father in judging people. This seems to be the case, thanfully, given how he tests Macduff's loyalty.