Chain locks work better with ground anchors than D locks do. This is thanks to their greater length and size. A larger locking area can be a good advantage when securing your bike at home, as you'll be able to secure more than one bike at a time.
A chain lock consists of hardened metal links creating the chain. The chain is locked with a padlock. The links and chains as a whole vary in size, weight and strength. Usually the more secure chain locks are heavier, but are less portable.