Recently moved a giant gourami into a 180 acrylic and the sucker barely fit into the tight opening. I should have gone with a bigger tank cuz it'll outgrow this one soon. I'll probably have to cut the top opening to get the fish out when the time comes.
With big tanks, the ease in moving acrylic is enough for me.
Only bad thing about acrylic is it can scratch easily. Especially with big fish and sharp fins. I use a mag float acrylic and have pieces of felt sandwiched between the magnets. I can't see too many scratches unless the lights are off and the sun is shining on the tank. I'll never buy a big glass tank again I was looking for a new tank 12x4x3 and after talking to 4 different builders I felt most confident with the guy who builds the tanks for fishtanksdirect