I vote for Acrylic. It can be made to order, more accurately, (For built ins) and endless shape options. Also more quickly. I talked to Blue Sierra, The Best Store that I have found, by the way, and they told me that you could make a baby and birth it, by the time your tank is ready. You will have a cleaner look with acrylic. Bent corners, and no ugly rims to look at. I looked at this local aquarium builders tanks, and their AWESOME! Blows away the national brands. He is quicker, more accurate, and knows his stuff. CFI is the company. Forgot his name, but I'll be buying one of his for sure! Just my .02 worth....