It’s all about risk management. If you are willing to hit the pavement in a half-helmet in order to get the wind on your face, and you’ve really thought through what it would be like to die or live life with a horribly disfigured face, then get a half-helmet. If you’d like to avoid said consequences and are willing to put up with a few stuffy moments, get a full-face helmet. There is no debate about which is safer. None. A full-face helmet protects the most likely impact zones. A half-helmet does not. Notice that visor+chin+base-of-skull account for more than 60% of all helmet impacts:
It’s just a question of balancing your desire for physical comfort and risk, and that’s entirely up to you.