It depends on what your pulling it with. My V-nose was the best pulling trailer behind 3/4ton pickup that I ever had. It cut thru the air and the sloped front really planted the trucks rear tires at highway speeds. That said, it was awful behind small motorhome. The height of the mh made the vfront a sloped roof a mute point.
Square front trailers lack the aerodynamics but are much better for storage cabinets, etc.