In what way do Macbeth and Lord of the Flies compare in relation to power other than corruption?

In both William Golding’s Lord of the Flies and William Shakespeare’s Macbeth, the thematic idea of power is addressed. As your question states, most analysis of power in these texts focuses on the corruptive nature of power. However, both texts also present alternatives to this corruption through characters who are moral rulers.
Ralph in Lord of the Flies demonstrates the use of benevolent power. His natural leadership skills, and the fact that he blows the conch for the first time, cause the boys to select him as their chief despite Jack Merridew’s obvious experience as the choir leader. From the beginning, Ralph sets priorities for the boys and establishes rules to keep order on the island, such as the signal fire and building shelters.
Golding uses subtle descriptions to suggest Ralph’s temptation to be corrupted, such as his excitement upon landing a spear in the boar’s snout. Like Jack, Ralph is thrilled with the prospect of the violent hunt—an impulse that drives Jack to corruption in the novel. Despite these temptations, Ralph chooses the path of righteous leadership because he innately feels it is the best choice to serve the majority and achieve his goal of rescue. Although Jack represents absolute corruption, Ralph represents the moral leader who never allows his power to change his strength of character.
In Macbeth, Malcolm demonstrates his moral leadership. When he returns to the play in act IV, Malcolm has achieved several positive accomplishments in order to challenge the corrupt Macbeth. Malcolm has not only gotten the blessing of King Edward the Confessor but also amassed an army to join him in challenging Macbeth’s evil reign. Malcolm explicitly states his motivation for facing Macbeth when he tells Macduff he worries for the future of Scotland: “It weeps, it bleeds, and each new day a gash / Is added to her wounds” (4.3.41–42). This shows that Malcolm’s quest for power is actually a noble one. This is further demonstrated in Malcolm’s apprehension about killing Macbeth when he says that he is unsure of whether it is the right course of action, of which Macduff assures him. Malcolm’s triumph over Macbeth represents the triumph of good over evil, but it also shows that benevolent leaders who use their power for moral purposes will eventually prevail.
Ultimately, both Ralph and Malcolm represent a kind of power that diametrically opposes the corruption evident in Jack and Macbeth.