I have used both in the last six years and apart from points already covered, my main observations are:
-BB is faster at uploading and absorbing data organisation changes.
-CP has more control but the interface is rather clunky.
-Support for both is good but CP probably better, but I needed them more!.
-CP was more prone to needing attention.
-CP backs up only what you tell it to.
-BB backs everything except what you tell it not to. (After editing the default exclusion file types)
-for non tech users I tend recommend BB as more ‘fit and forget’ and simpler.
-I use BB mainly because of the first point. I tend to reorganise my 4TB, changing drives and computers etc. BB keeps up, with CP I was always waiting.