Glass weighs more, is more prone to leaking over time due to the silicone seals, and is easier to break. It is easier to clean, as you don't have to worry about scratching, and is cheaper than acrylic.
Acrylic weighs less, is less prone to leaking, and is tough to break. Cleaning algae is a problem, as scraping too hard will scratch it, forget about using a razor blade. It is expensive compaired to glass, and I've heard some plecs & snails can abrade the surface, causing it to cloud.
All the tanks I have running are glass, I have 1 used PetSmart acrylic 28 gallon that is looking for room to be set up. I prefer standard rectangular glass tanks in standard sizes, they're cheap, and easy to find used. Couldn't pass up the 28, $3 is a killer deal.
Tolak