I have several high-end full-face helmets to choose from.
I also have an open-face (3/4-style) helmet, which I wear with googles or sunglasses.
Despite the greatly reduced protection, I sometimes prefer the open-face for the old-school, exposed "freedom" factor.
For some reason (the smells?), it is particularly delightful on crisp autumn days
(I also prefer un-faired, naked sport bikes).