I have a Davida that I love. The only thing I dislike about it is that earplugs are mandatory. I usually wear an open face Fulmer. Also a great helmet, and I don't need earplugs. I have a similar Bell 500, very noisy. I have several full faced helmets that I seldom wear, because it's just not stylin'!
I've had two crasheds that my face got into. One was in an airplane where my head ended up dragging down the freeway. As I was sliding along, I was thinking about the fact that I needed my helmet! The other one was the last one on the Enfield when I took a face plant over the bars and face first into a dirt and rock bank. A couple of stitchable cuts on my forehead and bruises around my eyes from the goggles and some bones broken around the bridge of my nose. Obviously a full face helmet would have saved me from looking like a raccoon that had been in a barroom brawl. The Davida probably would have been worse as the padding in the helmet is very old school, cork. They are not approved helmets.
I will replace the Fulmer with a new one and continue wearing it, but...
If your are looking for the best protection, get a full face helmet that fits right and feel good. I have a $200 Bell that I wear when I want a fullface helmet. I also have a Shoei, and an HCI flip front. I've owned Arais and other expensive helmets. Don't use price as a guideline. If it's Dot approved, you are pretty much going to get all the protection you can. After that, it's form and feel. The expensive ones don't offer any more protection. I have smacked some full face helmets from different angles including right on the front, and straight down on top of my head, and they have always worked as advertised. Never any damage to me.
Bare