Both companies make great products, but I've never owned an Arai.
I've had Shoei helmets since I've been riding Busas. I suffered only minor injuries (no ambulance involved) in my crash, and I took all of these pictures. They definitely do a great job.
This Shoei RF-1000 saved my life last year.
This mark is from a hard impact with the road. That was a potentially fatal impact, had I been wearing lesser protection.
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This one is from the rusty guardrail that runs along the Cherohala Skyway. Shoei uses good, strong shields. I know that because my ugly mug is still intact.
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Here's how it happened...