Helmet aerodynamics are very individual and it is impossible to tell which one is best, or even, better for a given rider over another.
That said, there are several “safe” choices that generally test well for the majority of riders. The Aerohead is one, as is the older Giro Advantage. The Louis Garneau P-09 also tends to test well.
So if you can’t test, the Aerohead is a solid choice.