I switched from CCC to SuperDuper a couple of years back. One word of caution; after cloning, it's worth verifying the sizes of the original and clone drive. I cloned a FCP media drive last year, and found that the clone size was quite a bit smaller. I compared folder sizes until I found out that one very large source video file did not copy over (it can't even copy over when dragging via Finder, to be fair), but I wish that SuperDuper had alerted me to the fact that a file couldn't copy instead of just saying that the process was complete with no indication.
There are some differences. I can't remember what exactly, but the Mac tech. at my last job recommended the change as there were some very specific reasons why SuperDuper was a better match for our needs. Come to think of it, I believe it was specific to the fact that we needed something which could handle automating the backup of a 5.7 TB XRAID array to a network folder, by breaking the backup into modular chunks of folders for different nights of the week.