The Dakota cabin is 42 inches wide. According to the internet, the 180 cabin is 40 inches wide. So it seems the Dakota is a little wider. I think I'd climb in one and try it before trading planes.
Now, if you want a wide cabin ... at 48 inches the Cherokee Six/Saratoga will spoil you forever!
As far as I can tell, there is no significant difference with the 180 at 41.5 and Dakota at 42. I am just kind of getting tired of getting elbowed on long trips when flying with a large person but doesn't appear to be a model much wider until you get up in the 6 range.
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Now, if you want a wide cabin ... at 48 inches the Cherokee Six/Saratoga will spoil you forever!