Hey there. Merry Christmas!
The currency hedging is actually the "advantage" if you view it as that. The other thing would be the dividends paid from these companies are paid in CAD. This can be an advantage to someone who is in retirement and doesn't really travel abroad that much and utilizes CAD. If one owns USD stocks and doesn't use USD, they have to convert it back to CAD. This has worked out very well recently with the falling CAD, but isn't guaranteed to work out well in the future.
I'd say the weaker the Canadian dollar the more attractive these CDR's become. The hedging has cost investors a lot of currency gains due to the weakening CAD but if the dollar starts to strengthen the hedging will actually help.
Ultimately, it is all a personal decision. I currently hold the USD NYSE listed companies, but if the dollar got weak enough (thinking $0.65~) I would no doubt start buying the CDRs over the USD listings.