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If the funding source is know i.e how much equity and how much debt, NPV is the best as it let you know how much excess you will make over and above your cost of capital.
However, if you have not yet decided the funding source and want to evaluate the project IRR gives your the project's rate or return. Using this you can decide whether to investment or not based on you ability to secure funding that ensures your cost of capital is less that the IRR
IRR is better as it help you compare with many other accounting ratios such as ROCE, ROE as well.
