Based on the information provided, the most accurate conclusion is:
The Johnson administration was more liberal than the Nixon administration.
This conclusion can be drawn from the context of the policies mentioned. The Johnson Administration is associated with landmark legislation like the Voting Rights Act and initiatives under the Great Society aimed at expanding civil rights and welfare programs. In contrast, the Nixon Administration is known for the Southern Strategy and environmental regulation, which indicates a shift in focus and political strategy. Thus, the framing of their policies suggests that Johnson's approach was more progressive and focused on social reform compared to Nixon's administration.