I have both acrylic and glass.
Acrylic is a better insulater, lighter, and is colorless unlike regular glass. Acrylic does scratch very easily but there are scratch removers that you can purchase. You just have be careful when working in the tank to avoid scratches. Acrylic cost more than standard glass.
Standard aquarium glass has green tinted color to it unlike Acrylic which is colorless. Some people don't like glass for this reason. Glass cost is cheaper. You can purchase tanks made from low iron glass(like Starphire) which greatly reduces the green color tint so that it's colorless. Low iron glass is a lot more expensive.