Acrylic is clearer, sturdier, weighs less, easier to drill and doesn't cause as much angle distortion while viewing. However I would choose glass perferably Starphire which is more clear than regular glass. Acrylic simply scratches too easily for my liking. If you plan on keeping stoney coral, you have to be extremely careful. Don't wear a belt buckle, zipper or heck even a pair of button up pants unless you are being very careful all of them have been known to leave a nice long scratch on an acrylic tank while someone was performing maintenance. Getting coraline algae off can be a monster pain as well as you can't use a razor to slice it off like glass.
Acrylic can also craze and haze but this generally won't happen if you buy a tank from a reputable designer as this is usually a quality of the material issue. Lastly on acrylic... the cost. Tanks can cost quite a bit more.
In the end glass is easier day to day. It is heavy and pain to get in the house, but once it is in you will forget about the weight.