I used to use glass for exhibits (max size was 20x24"), but after a galley worker dropped one of my pictures and broke the glass, I switched to acrylic and have never turned back. (The print was undamaged, by the way; I just had to put in a sheet of acrylic to replace it.)
If possible do check the lighting where you will be showing to decide whether to go with non-glare or not. With good lighting, correctly positioned, glare should not be much of a problem, and the "glare" surface will show deeper blacks than non-glare does. But with badly positioned lights, you may want to use non-glare.
For acrylic, be sure to get the approved type of acrylic cleaner and clean both sides of each pane. Don't use Windex or regular glass cleaners.
Good luck with the show!
Eric