Madara wins this
--using shadow clones as a diversion to attack obito the moment he solidifies to attack and clone fients to force obito into warping a clone which is a GG
--madaras speed is much faster than obitos, and his choku tomo precog is well above obitos, so tagging obito and landing a hit isn't a problem at all, added with the fact that his sharingan can locate obito when he's tangible just ensures this notion
--katons are non factor they are matched with madaras own, and with clones on The agenda he can get a them to smack obito from behind when he is attempting to use the katon