Aluminum sand scoops are preferred by many beachcombers and metal detectorists for a few reasons. 

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Lightweight:   Aluminum sand scoops are lightweight compared to their steel counterparts.  This makes an aluminum sand scoop more comfortable to use for extended periods. This is particularly beneficial for beachcombers or treasure hunters who need to carry the scoop for long durations.

Corrosion Resistance: Aluminum sand scoops are extremely resistant to rust and corrosion that can be brought on by saltwater.   They do not rust easily, which means an aluminum sand scoop can maintain its integrity and durability over time.

Maneuverability: Due to its lighter weight, an aluminum sand scoop offers greater maneuverability and agility when sifting through sand or gravel. It allows for quick and efficient scooping, making it easier to locate and retrieve objects.

Reduced Fatigue: The lightweight nature of an aluminum sand scoop helps reduce fatigue during use, as it requires less effort to lift and maneuver compared to a heavier steel scoop. This can be particularly advantageous during long beach or water excursions.