Quality of fit and finish, sizing peculiarities. Arai and Shoei for example fit two distinctly different shapes of head (or at least they used too.)
So it is a case of go in, try as many on as I can, and if my heads says yes, go for it. Rationally of course. Shoei sure make the wallet itch.
@Chak started
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Quality of fit and finish, sizing peculiarities. Arai and Shoei for example fit two distinctly different shapes of head (or at least they used too.)