My 0.2¢ from experience with an acrylic tank...
Cleaning coralline or other hard algae off acrylic is NO problem. You simply use a plastic credit card or algae scraper - piece of cake.
A big issue not many people talk about with acrylic tanks is insulation which I have to deal with.
Pros:
-Lighter
-Looks nicer - rounded front corners, black back etc..
-Retains heat and has good general insulation from temp fluxations
-More durable and stronger than glass, great choice choice for earthquake prone areas like California
-Has a partial built in hood, basically there are only cutouts on top for lighting and hoses.
Cons:
-Scratchese really easy, I wish I new JUST HOW easy when I started
-More expensive than glass, alot more expensive
-Retains heat too well...you need to be careful if your tank environment would ever run into heating problems (hot climate, heat producing aquarium equip., etc.) because the acrylic will augment all heat in your system temp.