as for glass vs acrylic, In my experiences glass is far superior to acrylic. Mainly because i hate to burn my weed in a metal bowl, it just dosent taste right. When the weed burns on the glass is tastes much better. Another reason i would choose glass is because acrylic bongs typically have carbs and there is a good chance bongwater will spill out of it if you (or your friends) forget about it.
The third reason i would choose glass is that the acrylic bong REEK, especially after a couple months and they are pretty hard to clean. With a glass bong you can just just fill it with water and drop an efferdent in and itll come out lookin brand new.

Glass is a little more expensive but i think its well worth it in the long run and I'm pretty sure most experienced smokers would agree.