overflow idea wich one is the best ?

[Dom]

im having my tank drill , and i would like ur opignion on what kind of overflow is the best betwen thoes two ?

i have the choice betwen ...

drilling the bottom and put a pipe as overflow

and my second option is drilling on the right and left upper corner of the back panel and put somme elbow in the bulkhead that goes up at the edge of the water

what u think is the best choice ?