ModeHow meaning is expressedRhetorical effect
Literal speechWord in its established senseDirect indication
Explicit speechQuality named directlyUnambiguous expression
KināyahIndirect sign to targetAssertion with an indicative support
Majāz / metaphorTransfer supported by contextAssertive vividness and intensity
This is not a claim of absolute superiority in every context. For a given audience or task, a plain explicit statement may be preferable. The discussion concerns capacity for rhetorical emphasis.