Aluminum boats are an interesting option to fiberglass. I had an aluminum catamaran in the early 80's I bought used and recently saw it still being used in Tampa and it is now 43 years old. If taken care of with some simple maintenance, they last and last.
They are lighter and thus better on fuel than most fiberglass boats. Unless they are well insulated they are noisy at anchor as the waves ping against the metal hull. Mine needed electrolysis protection and had a gauge in the cabin that showed me when stray currents were likely to eat my boat. Currents came from poorly wired docks, being close to some boats with generators, etc. I kept an anode for aluminum on the keel and carried rods of the same material. Then I could clip the rods onto my cleats until the gauge was in the good range so the rods in the water sacrificed instead on my boat hull.
There was no skid protection built into the aluminum so I added fine ground glass to deck paint to help. Finishing aluminum to fiberglass mold quality is difficult and expensive so I used non-gloss paint to cover some lack of smoothness sins in the hull and cabin.
Hull painting usually meant going down to bare metal, good aluminum priming, then final coats.
Added labor (welding) made my aluminum boat more expensive than a comparable fiberglass hull. But I ran it up on the beach and through debris that would have chipped fiberglass so it had many advantages too. ...................Pete
