I only see one real advantage to glass. Glass is much more scratch resistant, although I do have scratches in my 55gal glass tank. Ready made glass tanks are cheaper mostly because they are mass produced. If you price out a custom acrylic and glass aquarium, the prices are not far apart. I disagree with clownfish because I think acrylic is much more clear than glass.
For any normal size tank I would buy a glass tank only because they are mass produced. Anything I build would be acrylic, but I haven't had a chance to build a full tank yet, only small things. One day....