Aluminum boats are easy to tow, durable, perform better with low power, tougher around rough or rocky conditions, easy to modify, easy to clean when no interior there. Cons; noisy, blow around in the wind, ride rougher due to lack of weight(mostly flat bottoms).
Fiberglass usually rides better, quieter, and dryer due to better hull design. They're heavier and take a few more ponys to push, and tow. Storage in most aluminum boats is less than in a glass boat, and weight of the hull as you move around in it makes it a somewhat more stable platform. I'm pretty good sized and my last metal boat would move real fast underneath me when I lost my balance or turned around quick. Just a few thoughts, hope it answers some of your questions.