Fiberglass windows are up to eight times stronger than vinyl windows, implying that they would endure longer. A high-quality vinyl replacement window can endure for 30 years or more, while a fiberglass window can last for 50 years or more. Because of its composition, fiberglass replacement windows are stronger and more lasting. They also tend to be less expensive over time. However, vinyl windows are easier to work with when replacing door panels or other such tasks because they're thinner. Also, if you need to paint your house in the future then vinyl is the way to go since it's easy to clean. Fiberglass windows require more work to install but they are worth it in the end. They look better and last longer than vinyl windows.