Ghost (External Overflow) or built in corner??

If you have the room outside, go that route.

A. Inside of the tank will have clean lines and no obstructions to flow.
B. If in the event of a fish/snail go over the weir, much easier to get it out.
C. More room for plumbing. Most corner overflows will only fit 2 pipes, whereas the external you can set up a quiet running Bean Animal style drain.

I have had both. One of the must have's when I did my new build was an external overflow. So glad I went this route. My tank is dead silent.
 
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