There are some out there who are adamant that Sigourney Weaver and Susan Sarandon are the same person.
Sigourney Weaver was born Susan Alexandra Weaver, on October 8, 1949, in New York City.
Susan Sarandon was born Susan Abigail Tomalin, on October 4, 1946, in New York City.I will attempt to remain impartial throughout. Given those two bits of information, it seems rather suspicious that people would confuse the two actresses. Fact: they were both born Susan. Fact: they were both born in New York City. Fact: they were both born in October. Fact: they both have careers in acting. The evidence is strong here, but I would have to concede that these two actresses are not, in fact, the same person.
Sigourney Weaver is known for her role as Lieutenant Ellen Ripley in the movies Alien, Aliens, Alien 3, and Alien: Resurrection. Susan Sarandon could never be as badass as Sigourney Weaver in this role. Sarandon would try to reason with the aliens, and cry for them.
Susan Sarandon is know for her roles in sentimental movies, with the exception of Thelma & Louise (1991). Okay, I've lost my impartiality. Given the choice between the two actresses, I choose Sigourney Weaver as my favorite. I loved the Alien movies. Well, Alien and Aliens. The third and fourth movies were crap. She was also in the Ghostbuster movies. I can only think of one movie that I've seen Susan Sarandon in, and it is not Thelma & Louise. It's "The Client", based on John Grisham's novel of the same name.
So, we can conclude that Sigourney Weaver and Susan Sarandon are not the same person. Furthermore, if given the choice of which is the better actress, the choice is quite obviously Sigourney Weaver. You're welcome.