Important Restoration Dilemma Please Help

I vote to do the Dart Sport.
The change over is just nuts and bolts and time.
Rust repair is expensive, even though the Duster doesn't look too bad at all.
Just be sure that there's nothing hidden under the paint of the Dart Sport.
It might be in the same shape as the Duster after you strip the paint off, then you're back to square one!
Good luck and keep us posted.