Re: Similitude vs. Tuvix
I think "Similitude" did a much better job of touching on the similar ethical problems than "Tuvix". And Sim was a more heroic character when it came to accepting the inevitable. Though it might have been sort of interesting if they had let Trip die and a long-life Sim had to take his place.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)