Depends on the context. I usually say “Star Wars episode 4 - A new hope”, but if I’m talking to someone of an older generation, like my dad who saw the OT in theatres when they first came out, I say “Star Wars”.
And, then with some people, I say “Star Wars, you know, the first movie, the original one from 1977”. Because sometimes that’s the only way to make people understand which movie you mean.