Neither choice here would end, say, Tuvok’s consciousness.
Arguable, since the result is neither Tuvok nor Neelix, but a new one based on those two. They’re not active, seperate consciousness stuffed into a Tuvixian body.
And unwinding Tuvix ends Tuvix’s consciousness. Neither Tuvok or Neelix keep Tuvix as part of themselves afterwards, he’d basically die if that was to happen.