The cost the same. The Carbon Copy is analog, and the dd-7 is digital.
The DD-7 has way more settings so you can really play about with it to get the perfect sound.
The carbon copy is much more basic. but still sounds awesome.
Get the DD-7 if you want to be able to chose between different delay sounds, get the Carbon Copy if you just want to use the same delay sound.
I would say go for a Line 6 DL-4 though :)
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