Board Thread:Naruto Discussions/@comment-25294339-20140822225116/@comment-5407586-20140823205156

Obito/Kakashi's Mangekyo Sharingan look way too powerful. They have the perfect defense (Kamui's intangibility), along with extremely good offense (long-range Kamui, Kamui Shuriken). The only problem is that they would eventually go blind since they're MS. After them, I'd choose Hagoromo/Madara's Rinnegan (supposing they have the same powers along with the same design), because Limbo: Border Jail and the Six Paths Technique are way too strong to be defeated one-on-one.