If you want it to last and be easy to clean I would definetly go with acrylic.
Today's fiberglass is junk. One more cost reduction by thinning the wall thickness and all units will break in shipping.
Or you could go with solid surface, Swanstone, Viktrel......etc.
This is a great example of "You get what you pay for".
I'm in the process of remodeling my basement bath and I went with an acrylic shower pan and walls.