If a firm has only independent projects, a constant WACC, and projects with normal cash flows, the NPV and IRR methods always lead to identical capital budgeting decisions. What does this imply about...

If a firm has only independent projects, a constant WACC, and projects with normal cash flows, the NPV and IRR methods always lead to identical capital budgeting decisions. What does this imply about the choice between IRR and NPV? If each of the assumptions were changed (one by one), how would your answer change?