The factorial function is preferred over factorial_v2 because:

Direct Return vs. Variable Update:

factorial returns the result directly from the recursive call, which is more efficient and simple. factorial_v2 stores the result in the variable n and then returns it, which adds unnecessary complexity and potential inefficiency. Efficiency:

factorial is more memory-efficient because it uses the return value directly, while factorial_v2 stores intermediate results in a variable, which could lead to unnecessary memory overhead. Simplicity:

factorial is simpler and more readable as it immediately returns the result of the multiplication. In summary, factorial is the preferred version because it is more efficient, straightforward, and easier to understand.