The Bigger Dipper Formation was created by Wang Chongyang, while Zhenwu Seven Formation was created by Zhang Sanfeng in honour of the great Zhenwu.
Both formations contain profound Taoism philosophies/theories. When used by a group of people, it could be used to great effect against powerful single opponents.
The Zhenwu Seven Formation could probably surpass Big Dipper Formation. It was mentioned in HSDS that seven people were to combined with this formation, it would be like having 64 people. Each person have their own personal martial arts, and could be freely combined. Even combined with other people who have no idea of this formation, no complications will arise when they fought side by side.
Which formation was better or more powerful?