Smaller tanks I like glass, but or very large tanks the glass ends up so thick that it actually starts to warp the view, and this is wear Acrylic really shines.
Anything over 4 feet long is what I'm referring to. You get used to glass, my 5 foot tank is glass, but put it beside acrylic and it's a world of difference.
Its official glass is the top dog...Its CLEAR to see glass won..pun intended...also it was a factor that we have alot of people in this forum with smaller tanks.