Whats the advantage to doing a chapter 13 over a chapter 7?

chapter 13
Frog asked:

I am under the impression that on a chapter 13 you repay your debt but on a 7 you walk away from your debt. So does society look at a 13 more favorable? And in a 7 you start to rebuild your credit as soon as its discharged, in a 13 do you have to wait 5 years to start rebuilding your credit? If this is all true, why even offer a 13?

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