The peak on so called "adventure" style helmets is useful for keeping the sun out of your eyes when its low in particular, and that style of helmet tends to have better ventilation as the chin bar is usually that little bit further away from your mouth. Downsides is that the peak can vibrate quite badly, but that can depend on the bike / screen / rider / wind direction / trucks / cars etc etc, also the extra ventilation might not be wanted when it's cold and / or very dusty so having a removable chin curtain is a great help.
If money is no object then have a look at the Schuberth E1 https://www.schuberth.com/en/product...elmets/e1.html for a helmet that ticks most of the "adventure" boxes including an eye watering price. Only you can decide whether it's good value for money.
Personally I'd look for a helmet which includes an internal drop down sun visor, very useful.
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