Oh yeah, there's a big difference. The only thing you'll be able to do with those DVD+R disks is write data to them from the Finder and burn them using some 3rd party software like Toast or DragonBurn. You won't be able to use them with any iApp, and even using them to burn data with the Finder will be flaky. OS X does not officially support DVD+R/RW disks. It doesn't even officially support DVD-RW disks, though they work most of the time.
For the highest level of compatibility with OS X and all the iApps, get DVD-R disks.