Beaufighter and Mosquito as complementary aircraft

What was the point of the Beaufighter when the Mosquito existed, or vice versa?

They were complementary: the Beaufighter was a heavier long-range fighter, while the Mosquito was more often a light fast bomber.

The Beaufighter and Mosquito filled different operational niches. The heavier Beaufighter was well suited to long-range fighter work, while the Mosquito was more often used as a light fast bomber. Their shared lineage and overlapping capabilities made them complementary aircraft.