If I had a lot of money, I would go with acrylic, but I voted for plywood. I am going to be building my 270 gallon ray tank out of plywood with glass. I am going to use pond armour and fiberglass cloth for the seams.
All the large public Aquariums we have built have been glass, except where you need to 'bend' the shape. The outer case or back if you like, is often coated stainless steel. But these are aquariums holding >20,000 UK Gallons. The down side with glass is age, it sags from top to the bottom with age leaving a weak seam.
Dosnt matter for most situations and sizes, but get to super size and you have problems 10-15 years later with weeping seams.