obviously the aluminum and fiberglass are hard to compare. totally two different types of boats. I would go aluminum. I like that you get all the same features as a glass boat, it is light weight, smaller motor and get some good speed out of it. there are plenty of aluminum boats out there check them all out.
check this link out
http://mercurynewsroom.com/gustafson-cox-put-forrest-wood-cup-hopes-on-aluminum-boats-powered-by-mercury-225-pro-xs-200-verado/