Deva path did have some interesting push and pull physics. You do bring a good point to the table. The thing is, I can't give this fight to both of them. I am torn. At one hand, you have Nagato with fully functioning 6 paths, on the other hand, you have Tobi that manipulates space time Jutso effortlessly. Since this isn't pein anymore, there is no one to revive, like he did with the six bodies. If he dies, he can't revive himself. Chibaku Tensi is a very powerful technique, but look what it did to him.
On the other hand, Tobi seems to have both the Sharingen and Rinnegan. According to Madara, a pair is needed, so I guess we can count out this eye functioning properly. But his Sharingen seems to be his advantage to detect Nagato's movement. He call simply slip through over and over again to tire him out and then attack.
Again, both sides have positives and negatives. I'll say, it's a 50/50 battle.