Machining
Glass can not be easily processed by sawing, milling and bending. Moreover, it is a lot more difficult be form after heating. Scratch resistance 
Glass is harder to scratch.

Acrylic sheets can be supplied with a scratch-resistant coating (hard-coating) which provides extra protection. While scratch-resistant acrylic are not nearly as scratch-resistant as glass. Small scratches in acrylic can be polished. Scratched glass most be replaced.

Light transmittance 
Glass has 90% light transmission, for acrylic it is 92%.Gloss 

Acrylic provides a softer reflection of light. Station glass and acrylic opposite each other and one is seldom in doubt about what is what. Acrylic with glass look is acrylic added a bit of color so that it even more looks like glass.

Weight 
Acrylic weighs less than half that of glass. 

Impact Resistance 
Acrylic is much stronger than glass and thus more resistant to strokes (10-20 times).

When acrylic shatter, it is, in contrast to glass, in large pieces with relative blunt edges. At the same time contribute the low weight to make acrylic much safer.

UV light 
Standard acrylic allow as opposed to glass UV light to pass. Acrylic sheets can also be delivered with a UV filter.    

Insulation 
Acrylic insulates better than glass, and is used heavily in skylights and doors to coolers.

Manufacturing 
Molding and extrusion of glass items are more expensive and requires much more energy.