An argument can be made for Madara.
-His speed and reactions surpass Obito's by feats, and it's not even close. So does his Taijutsu skill, and that isn't even close either. If Obito tries to grab him to warp him, and doesn't come by surprise, he'll fail since Madara can force him to slip through one of his attacks.
-He has Shadow Clones, which allow him to keep watch at multiple angles since Obito can teleport around the battlefield. It also lets him attack Obito, forcing the latter to go Ghost Mode if he tries to attack, and if he's fast enough, he can kill Obito while's he's warping a clone away. Clones stop him from surprising anyone.
-Obito's only Mokuton feat on his own is making a small branch. Madara was chopping Shinju Branches much larger than that. Obito's Mokuton is fodder level here, and thus is a non factor. Inb4 someone brings feats of him and Spiral Zetsu. Spiral Zetsu is confirmed to boost the Mokuton of the person it's covering. Yamato shows this, and the Databook states this.
-Obito's Katon is just as large as Madara's, and Madara can absorb it with the Gunbai and redirect it. Or he can tank with a Ribcage.
-Obito's Kamui Weapons are fodder too. Gunbai blocks with ease. Or he can tank with a Ribcage.
-Izanagi only lets Obito prolong the battle, it doesn't let him actually defeat Madara.
-Uchiha Kaenjin gets fodderized by Susanoo.