Well, I have had both. I really like the acrylic. It is way lighter in weight, alot clearer (no green tint) and keeps its temperature more stable.
The only down side to it is, you have to be a little bit more careful with it as it is easier to scratch.
I am currently in the market for a 120g (48X24X24) or 150g(60X24X24) and would love to find it in acrylic except in my case I have found glass to be cheaper especialy in the standard 120.