Photochromic glasses are always better than non photochromic ones, as they cut out harmful UV and infrared rays, especially in India as it is always sunny here. The only disadvantage is that it adds weight to the glasses. It is also better than tinted glasses as the tint clears when you are away from sun. Now-a-days you can get thin plastic photochromic lenses as well to counteract the weight. Antireflection coating is a waste of money and does not benefit one significantly.