There's no use denying it, cost plays a huge role in deciding what we buy. 

Acrylic is much easier to manufacture than glass, its lighter weight means that it's also cheaper than glass to transport and the fact its stronger means manufacturers don't have to raise the price of individual units to cover for expected breakages.

All these means that acrylic is much cheaper than the same sized piece of glass

We all know how terrible it feels to crack or shatter glass furniture, it absolutely ruins your whole day. 

Then you have to turn the entire site into a crime scene as you check for every last, little piece of glass… but don't worry, no matter how hard you look, you'll never find them all. But you will step on a small piece 2 weeks after. If you've got kids at home, this is enough reason to go acrylic.

Acrylic sheets are between 10-20 times stronger than a similarly sized piece of glass.

Which means they won't break or shatter if you drop them or drop something heavy on them, you'll get a little mark if the hit was hard enough, and if it the hit was obscenely hard, it won't shatter, just break into large dull pieces you can easily pick up and dispose of.

Yep, it isn't looking too good for glass.

Acrylic sheets are usually half the weight of a similarly sized glass sheet.

This reduced weight has some heavy advantages for you. 

Your acrylic piece is much easier to carry around and install, saving you a lot of stress in the process. If you use it as a table top or window, it's easier to move around the entire piece when it's done too.

The light weight means you can also use them without fear of damaging the platform they were going to rest on, which means if you wanted thicker, more soundproof windows but didn't want to replace your frame, acrylic would be a much safer bet then glass which might be way too heavy.

Acrylic is a really flexible and strong type of plastic, which means they don't degrade as easily as other materials.

Your patio table will look awesome for years. They don't fade or discolor easily and are, just like plastic bags, completely waterproof. So whether you leave them in the baking sun, monsoon rains or freezing hail, they'll still look awesome.

When we say better, we actually mean clearer.

At large thicknesses, glass actually takes on a slightly green hue, which you can easily see when looking at the sides of the glass piece. Acrylic on the other hand stays clear throughout the piece, making it a much better choice if you're going for a clear look and intend to have the sides visible.

From the front, they're usually both just as clear.