A difference between Martin Luther King Jr. and Malcolm X was that Martin Luther King Jr. believed in

Peace

Answer: Non-violence

Explanation: King grew up in a middle class family and was well educated. Meanwhile, Malcolm X grew up in an underprivileged environment that was very hostile with barely any schooling. Martin Luther King Jr. was always against violence, throughout his entire ministry. He always stood his ground, and he stood out because even though he may have been physically attacked, he never reacted with violence. Martin Luther King Jr. followed the Christian faith. Malcolm X, however, was a Muslim, and believed in Muslim principles (I'm not being at all discriminatory on any religions here). He believed in fighting back physically. Whatever had to be done to get freedom he was all for it whether it be violence or non-violence. Although later in life he visited Jerusalem, and met other Muslims. He changed his views, and became non-violent.