Photochromic lenses such as those made by Transitions Optical are clear (or nearly clear) indoors and darken automatically in response to sunlight outdoors. They also protect your eyes from 100 percent of the sun's harmful ultraviolet radiation.
Anti-reflective coating (also called AR coating or anti-glare coating) improves both your vision through your lenses and the appearance of your eyeglasses. Both benefits are due to AR coating's ability to eliminate reflections of light from the front and back surface of eyeglass lenses. AR coating is especially beneficial when used on high-index lenses, which reflect more light than regular plastic lenses. Generally, the higher the index of refraction of the lens material, the more light that will be reflected from the surface of the lenses.
It depends on your own choice and usage of your glasses. If you new glasses are usually used for computer use and night driving, you'd better choose anti-glare coatings. If you want to change the color of lenses on your glasses when you go outdoors and come indoors, you can choose photochromic. If you have both of the usage, you can choose both lenses to meet your demands.
transition glasses can change color from clear to dark due to the exposure to the UV rays. When you go outside, it turn dark just like sunglasses. When you go indoors, it will turn clear just like regular glasses. Anti-glare glasses are used to reduce the glare from the surface like water, glass and snow. So it just depends on your purpose. If you want to wear your glasses all day, then you can choose transition glasses. If you just want to the glasses that can reduce the glare, then you should choose the anti-glare glasses.