Mount Rushmore vs. Mount Everest: Apples and Oranges

The comparison is flawed:

• Mount Rushmore is a mountain (granite peak, 5,725 ft / 1,745 m) with a carved memorial (four presidents, 60 ft faces). It is a mountain.
• Mount Everest is a mountain (8,848.86 m / 29,031.7 ft) in the Himalayas.

Everest is ~5.1× taller than Mount Rushmore's summit elevation. The memorial is on the mountain; the mountain itself is modest by global standards. The question likely confuses the sculpture (60 ft) with the mountain.

Answer: Mount Everest is vastly taller.