Tough question.
On the one hand, if you watch 123456 you get the ordered narrative structure.
But on the other hand, watching 456123 ensures that your audience experiences the jump in visual effects.
If I had NEVER seen SW before, I'd like to watch it 123456, but either choice is a trade off.
I guess you have to decide what's most important to your audience. If they don't mind watching older movies (my kids wont actually watch movies pre 1980) then I'd go with 123456.
Either way whoever hasnt seen it yet is in for a massive treat.
