As a Team, Obito and Nagato IMO since Obito could turn others "intangible by making contact with them as shown with Sasuke when Raikage attacked Tobi, who was carrying Sasuke, and phased through both of them.
Nagato could use his techs without worrying about attacks that would overlap with his body. Obito's Outer Path was noted to be stronger than Nagato's but since he can't summon the Gedo, he can have Nagato do it for him. If one of them goes down, the other could assume control over the Gedo so it won't stay out of play nor will it recklessly rampage while those two are present.
And I just thought that Obito can throw a Mokuton spike while Nagato makes it go even faster with Shinra Tensei like he did with the nail.