Simply put, those puddin' bowl helmets are not going to offer the same amount of protection
as a a 3/4 or full face. Davidas are among the best of that style, but it really is a style versus
function choice. Remember early football helmets? Pretty much just a leather shower cap.
Sure, they offered some protection, but we have learned a lot since the 1950's.
That being said, I wear a japanese puddin' bowl, I like it and yes, it was a style decision but
my riding is usually commuter, about 15 minutes each way on inner city streets.
If I was doing a lot of freeway riding, I would get a full face.