Scorpion EXO700 full face all the time.
One night some years back I was driving in my Bronco at night and a rock the size of a ball joint hit my windsheild and almost took me out. I would not want something like that to connect with my skull or face while riding. I have had 2 cigarettes flicked into my face sheild at speed not to mention large bugs, a bat and a small bird. I guess I just like my face too much to ride with half a hat or none at all.
I saw a guy at Union Grove dragstrip who had wiped out with a bucket helmet on his Harley years before. I could not imagine living with that type of deformation. I believe a full face would have done a better job protecting his lower and middle face. My skin still crawls when I think about that dude.