Sakura with a miles gap in between them.
1. the sasuke miracle happened due to Tobirama being there, take out tobirama Kabuto wouldn't have been able to do shit.
2. Hashi's dna will run out
3. Sakura has more info regarding medical ninjutsu
4. She was trained by the best
5. She already surpassed him in chakra control
6. Treating thousands of ninja with different kinds of wounds, sorry no matter how much of a Kabuto fanboy or a fan or a fapboy you are there is nothing that compete againsts that.
So you're implying that Tsunade can bring back souls from Death God's belly?
Is it that shes implying it, or Orochimaru and Kabuto BELIEVED and KNEW she could. So your pick.
Hint: I would go with whats in the manga.