Backboards come in many different sizes, from a regulation 72” to a space saving 44”. A good rule of thumb is to choose a backboard size based on the size of your playing space. If you've got a home court or a large driveway, go for 72” - 60” backboards. If you're looking for a goal to put in a one-car drive way, shoot for the 54” - 44” range. This will keep your backboard from invading the play area if space is limited or allow you to get the performance you need for larger areas.
In addition to sizes, backboards are also made from several different materials. Here is a quick rundown on the advantages of the most popular options.
Tempered Glass Backboards: Tempered glass is the material that all competitive basketball hoops are made of, from high school to professional playing levels. Tempered Glass offers the best rebound response available.
Acrylic Backboards: Acrylic backboards are generally the backboards of choice for outdoor goals that are accessible to the public such as schools, parks, and churches. They offer great performance with an added resistance to vandalism.
Polycarbonate Backboards: Polycarbonate Backboards are very popular in portable goals because they are light weight and durable.