2 Purchasing Return types – what’s the difference?

Transactions > Purchasing > Returns Trx Entry > Return w/Credit & Transactions > Purchasing >  Trx Entry.  

What’s the difference between these 2 Return documents and when to use one over the other.  The Help says the Transactions > Purchasing >  Trx Entry then selecting Return is used to return defective items to vendor when the invoice has been vouchers.  Well, that’s the same situation  as Return w/Credit under the Returns Trx Entry screen so what gives?  Are they the same?