Glass shelves have grown in popularity in most home fridges, and a lot of commercial refrigerators are using them too. Glass shelves are often made from durable tempered glass that can hold a lot of weight without cracking. Glass shelves are also easy to clean and look nice when properly arranged. However, glass shelves can crack and even break. Wire shelves made from good materials like stainless steel are more enduring. They do not chip nor bend under pressure, and the spaces between the rungs allow for more cooling. Either option is good, depending on your needs.