Glass baking are the best because they distribute heat evenly which causes your food to likely cook at an even rate. Once the glass has warmed up, it will stay warm long after it's removed from the oven.
Heat is distributed consistently, it will promote even baking of your crust and as an added bonus, allows you to see the progress instead of if the bottom is brown yet.
Use glass dishes when baking with eggs or acidic ingredients as metal pan can react with the acidity and cause foods to discolor or leave metallic taste.
Glass pans cook faster than metal pans because they hold temperature more steadily. They are dishwasher safe because they are non-porous making soaking very effective unraveling burned on food-leftovers. With proper care, cookware made of glass can least last seven to ten years.