Hi,
All three brands are very good, but there are differences between even the Model line-up within a single brand.
Fit is important, it must pass the Roll-Off test - should be snug enough not to be able to be rolled off your head.
Comfort is important too as is weight, ventilation, and field of vision. And, you have to be sure that with Helmet ON and Seat adjusted, that you can pass the Broomstick Test for some venues. That is, 2" between the top of your Helmet and a straightedge (broomstick) resting between the Roll Bar and the Windshield Header - not required for all venues - check the Tech rules of whateer venue (DE, SCCA Solo, etc.) you intend to participate in.
I use the Bell M3 and it's an excellent Helmet, but most important, it fits my type of head. I believe it's range is fairly broad.
One suggestion, get together with your buddies and acquaintances who use a Helmet and try theirs to see what you like. Also, consider that the Helmet will loosen up considerably with repeated use, so plan accordingly - it will get more comfortable with time.
A Helmet Sock (or Balaclava) is a good idea to keep the Helmet Fresh. A removable and Washable liner is also a nice feature. Hope this helps...
Happy Motoring!... Jim'99
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