We have a law that states I must wear a helmet in New Zealand.
My preference is open face. Much easier to do everything (seeing, talking stopped, putting on and off with sunglasses) and cooler in the summer.
In the winter I wear a full face. Main thing (apart from protection in an accident) with a full face is the weight and how well the ventilation works. I own about half a dozen helmets and my fav full face is an OSBE (made in Italy) the ventilation is, for me, better than SHOEI (my previous favorite).
All my helmets are BLACK!