Being a part of moving a 450 gallon has made me never want one that big made out of glass, however owning acrylic has shown me how soft it really is.
I guess it comes down to the following:
Budget, as it would go plywood, glass, then acrylic for cost.
and if you are planning on moving.
If you are not going to be there 100% in the future for a long time I would think about acrylic as it is easier to move. However, there is no way to just cut down an acrylic tank so you must ensure that it is thin or shallow enough to get through doors ( or take walls out )