Data is read faster at the outer diameter of the discs. But, at the extreme outer diameter (last 1-2 mm maybe), discs can be harder to read.
I think (not sure though) that burning software places files on the CD in alphabetical order due to the ISO9660 spec. The files are at least listed in alphabetical order but perhaps where they are truly burned is random.
How would having files at the center help you if your discs are damaged?