It depends on the severity of the hail damage and the construction of the hood. In many cases, it's just cheaper to get another hood. But I'd try the paintless dent removal first.

As for the repair, gentle use of a torch can shrink the metal on both panels to remove or minimize the dents. Obviously you'd want to remove the headliner and engine silencer pad before trying this. Using filler to fill a hail dent, or series of dents, will most likely not hold, especially on the hood. These panels flex enough when opened or closed to cause issues.

The one thing to remember in regards to the hood. This is what you are staring at while you are driving. Any imperfection will be staring back.