Neither one is really a bad plan when you come down to it, they just believe in handling the "problem of the wastes" in different ways. I support Eden's however.
Lets use an anology. Say you have a picture that you are drawing that you screwed up. How do you fix it?
Autumn's plan is similar to taking your pencil and attempting to fix the drawing without starting over, you weave in and out of lines, and erase things where necessary.
Eden's plan is simply to grab a new piece and start completely from scratch. Its going to be a lot more hard work, but ultimately you might end up with a better picture.
Thus, Autumn's plan is to attempt to integrate the Enclave and the wastelanders into one group, while protecting them from the creatures of the wasteland and such.
Eden's plan is simply to create a blank slate and give the Enclave a homeland with nothing to hinder them.
Also, keep in mind that Eden's plan is not necessarily "evil." The effect of the modified FEV virus isn't going to affect much more than the immediate area of the CW (perhaps some of the east coast but that's about it). Not only that, but in the end his plan ultimately kills more "bad" things than it does innocent wastelanders because it targets mutants (centaurs, supermutants, etc.) as well as anything affected by radiation (which includes hostile wastelanders like the BOS, Talon Company, raiders, and the like).
The vast majority of the population of the CW is things that are either 1. militarily opposed to the Enclave or 2. hostile to everyone (mutants, raiders etc.) The minority of the pop are wastelanders like those living at Megaton.
In which case makes Eden's plan simply an act of total war. There's going to be collateral damage. Much like carpet bombing a heavily populated city.
Augustus didn't trust Eden, he openly rebelled against Eden. Why the hell would he want to honor him?
Because in the end he's still his President perhaps.
"I am sworn to protect the Presidency, the chain of command must be upheld, I wouldn't expect you to understand." Although Bethesda's writing makes it all screwed up of course.
I agree with Autumn about the masses flocking to the Enclave for protection and order.
One thing I can't understand about Autumn's plan is how he expects Enclave soldiers (who gladly shoot up wastelanders) to simply go along and suddenly become comrades to a bunch of people they were taught from birth to hate.
Seems wishful thinking to me.
Doesn't matter though, either plan would have been preferable if Autumn and Eden could have gotten along and if the Enclave had actually won.