Pre drilled tank vs overflow box

[dreamcatcherr9]

I see people say that a pre drilled (or drilling a tank) is better that a over flow box. True / False? Why?

For a pre drilled tank, is it better to have drilled in back of tank or bottom? I’ve seen both. Is one better? Why?

 

[Hemmdog]

The back drilled is better imo. It allows for more space to aquascape inside the tank and makes it a little easier to provide even flow. Then the overflow is outside the tank on the back with the purchase of a ghost overflow like this.
Amazon product