I would say MM and LOTR make the perfect pair of opposites with so many similarities.
Both are great games that play COMPLETELY different and have different styles and feels. Both would also last forever in a paired collection.
MM is light and funny with quick shot sequence. LOTR is dark and a great movie themed pin that I would likely never beat. The shots also have a nice variety.
Someday I will find a nice LOTR for a decent price and it will go next to MM.