The interesting tack is that Malcom X started kind thinking that revolution was the way to go and towards the end, was coming closer to MLK's position, which meant he was treated as a kind of traitor by those he left behind. The angry, black power movement which culminated in 1968 (with the 100 meter podium at the mexico games with a controversial black fist towards the sky). The black panthers were also seen as a dangerous movement that year.
But, its MLK's movement that had a lasting impact on national consciousness. You can't change people's opinions with a gun or violence; Ghandi knew it and MLK knew it.