I've used both.

The Shoei is lighter and more comfortable for me. It suffers less wind effect but the peak isn't as good, if like me you use it as a sun visor.

Another good reason I think is the cheak pads can be removed whilst the lid is on your head, I know the Aria can also, but not as safely and Aria don't bother telling the emergency crews, where Soei have at least given the Air Ambulances an overview of how to do it (at least here in the North West they have). To me, this is a big plus point

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Never underestimate the power of stupid people in large groups.