Which one? And what side? Good or bad? #whatside
If the choice is based on just that, and no meaning or connection to other characters, then a billionaire with unlimited resources. Use the money to help find cures for world problems, and stop the disease, not let the symptoms spread. Also, some of that money will go towards the bank to receive interest. Once there is enough money to live off of just interest, the principal will go to charities.