Several times in the episode we’re told Tuvix is better at specific things and in general than either Neelix or Tuvok. We’re told that because Tuvix went off of a hunch he solved some problem Tuvok was never able to solve. I never liked the hunch vs. logic dichotomy. I’m pretty sure Tuvok would test theories. Tuvix also shows up to work earlier than Tuvok. Not sure why