that would be sorta a question directed towards oweners of Marineland tanks (corner) VS. owners of All Glass (center overflow)
here is my take: mechanically & geometrically: (plumbing, water flow, symetry, et) the advantages of having the plumbing centered is obvious ...
but I bought a Marineland. IMHO the corner overflow is more aestically appealing even given the fact coraline algae will cover the "box" eventually anyway ...but be advised, its a semi PITA considering either the return or flow will have to be on a longer opposite end in so far as sump plumbing is concerned...
minor edge to the corner overflow, but not much