I have had several of both over the years.Glass is more stable to fish out of than aluminum and quieter.I have a 16' Slyvan aluminum now that is wide and deep,20" transom that is a good boat for the river and can even take it out into the gulf when it is not too rough.The main reason I went with aluminum was the lighter weight for pulling it to Florida a time or two a year and to be able to keep my old 1/2 ton Chevy.If I only fished locally would use a glass one.
Jake