Most tracks ask for Snell rated (coming for car racing specs) helmet.
Being a doctor in a major trauma center (lots of bike accidents) I doubt that there is significant diference between two similar, let's say full face helmets, in terms of pure protection in a wide price range. Fit and finish, comfort and other parameters maybe different. If you need all the small differences in helmet quality to save you in a car crash on track, you may not want to live the life you will have after.
I went for an open face light Snell aproved helmet for comfort.
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