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I would go with the Deep Blue.
It has a slightly larger foot print at 4.5 square feet vs 4.0 feet for the Marineland.
12.5% more room for coral.
That is assuming similar quality builds between the two.
If the tank is not going into a corner then my preference would be Deep Blue since it allows for viewing from both sides.
Also give you more below the tank options since the stand.
That said this is just what I would do.
Really no wrong answer here.
Why are you limiting yourself to those two choices? I'd probably go with the cube since it has more depth.

