Acrylic are clearer, But do scratch easier, less likely to leak, much easier do modifications if need be down the road, and don't get salt creep on the top like glass tanks. their much lighter and 17 time stronger. If you don't keep them wiped down regularly the coraline can take o toll on acrylic. most scratches if on the out side can be buffed out. to get coraline algae you'll need a plastic scraper
Glass tanks are much heavier, not as easy to scratch but if you do scratch a glass glass tank its not coming out. not easily modify, and most glass shop won't guarantee the work if you have them drill it. So make you get all the hole where you want when you buy your tank. Much easier to keep glass clean , you can use a metal scraper or any razor blade. another thing about glass if you malachite green or methylene blue it will stain the silicone. that s if you don't have the new black silicone that Oceanic uses.
I'm an Acrylic man myself. Most reefers like glass because its easy to get coraline algae off without scratching the tank. If i was going buy a glass tank it would be an Oceanic they have a tank line they call a brick style aquarium i really like. hope this helps. Good luck on your purchase.
Fishman