I have new version of both the
Schoei and the
Arai and I can't tell any difference whatsoever between the two other than that the longer peak on the
Arai helps when heading into a low sun.
I think that your height, the way you slouch or otherwise in the saddle, the angle of your screen and whether you are on a GS or GSA make much more difference than the simple make of helmet. I am 6ft3in and ride a GSA. I tend to sit straight and have the screen fully upright with a TT flip on the top of the screen. I have never had the peak caught in the slipstream even when doing a lifesaver, there is zero vibration on either helmet and I can ride at 90mph or more in both with the visor up and in perfect comfort.
The
Hornet is a bit more comfortable than the
Arai but I feel that this is more down to head shape than any intrinsic design differences. However the
X3 does have brilliant removable emergency cheek pieces so that paramedics can get the helmet off easily in a spill.

The
Arai also has arguably more interesting colours and design if that's important.
Another option might be a flip-front such as the
Schuberth C3 or
Shoei Multitech which can be supremely quiet whilst still allowing you to ride open-fronted in best Adventure stylee.
