From my limited knowledge: The Unix OS coder assumes the user knows what they're doing etc. versus the Apple's you can only do it the way you are allowed to do it, etc. Compared to other variations ...
I'm considering moving from DVD-Rs to Blu-Ray Recordable disks to backup my data. I don't have any experience with BD-Rs as of yet, though, and I wonder if it's worth it or I should wait another year ...