Fiberglass is nice but I don't know it gives me the idea of a ricer because they use that a ton.... I am not saying it's for ricers but it just gives me a picture in my head of ricers. But ok don't even mind what I just put, that was dumb. Fiberglass (if done right) look's slick. I like the aluminum method better.... I am a guy that like metal though so it all depends, if it were me then it would be aluminum and you can even mix it with fiberglass like the top of the dash do in fiberglass and the face (where the gages will be) do in aluminum.