So do you genuinely think that a crash at 60mph for example, you'd be a lot better off in a saxo than a metro because it has a higher NCAP? If a crash is bad enough to hurt you then it's gonna hurt you in a small car anyway... unless you drive a BMW or Merc then we're all as venerable as each other if you ask me.
You are safer in a Saxo. Hence the better safety rating. It will hurt in both cars, yeah. But the Saxo is less likely to trap and kill you.