Question

why is Taiga vegetation commercially more useful

Answer 1

due to great east-west extent. Absent in the southern hemisphere because of the narrowness in the high latitudes.
Experienced in the regions just below Arctic circle.
On its poleward side, it merges into the Arctic tundra.
The climate fades into the temperate Steppe climate.

Answer 2

Answer:

Taiga vegetation commercially more useful because it produces soft woods which is useful for making paper

Here, lumbering occupation important