Well, Oro seems to be able to use his hands again so it's not like the damage to his soul was permanent in any case.

And I would think twice before going to a doctor like Kabuto. He wouldn't give a shit of whether you make it or not. Probably he would just try to learn anything he could from your suffering but if he actually can cure you or not is of secondary importance. I'd say that alone makes Tsunade a lot better medical ninja. But if the question was whether Kabuto is a better mad medical scientist, then the answer might very well be different.