It depends on firm dividend policies and cashflows etc. You may apply discounted cash flow method:
1- if firm has a stable dividend policy and
2- You perspective is that of investors.

Or you may apply free cashflow to firm or free cash flow to equity models if:
1- Cash flows of the firm are positive.
2- Your perspective is that of an owner.

There are other discounted methods as well. But above given methods are mostly used.