Prefetch default implementation vs advanced implementation

Prefetch.cs

        //Default implementation
        public void Prefetch()
        {
            _InventoryItems.Clear();

            foreach (InventoryItem item in PXDatabase.SelectRecords<InventoryItem>())
            {
                _InventoryItems[item.InventoryID.Value] = item;
            }
        }

        //New Implementation
        public void Prefetch()
        {
            _InventoryItems.Clear();

            foreach (InventoryItem item in AACache<InventoryItem>.SelectRecords())
            {
                _InventoryItems[item.InventoryID.Value] = item;
            }
        }