Which group of stars has a higher luminosity white dwarfs or giants?

giants has a higher luminosity

Explanation:

A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. Giant stars have radii up to a few hundred times the Sun and luminosity between 10 and a few thousand times that of the Sun.

While a white dwarf is a small, very dense, hot star that is made mostly of carbon. These faint stars (less luminous) are what remains after a red giant star loses its outer layers. Their nuclear cores are depleted. They are about the size of the Earth (but tremendously heavier)