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From the links/images you posted, yes, the inkjet surface is the only difference.
AZO is not a coating. AZO is the name of the metallic-stabilized dyes used by Mitsubishi for CD-R and DVD-R.
The 8x discs are not necessarily better, no. There is some empirical evidence that shows the 2.4x media may be superior to 8x discs, but the variables are not always fully defined, so the statements are inconclusive in my opinion. I would suggest either disc is fine for your use. And I would burn 8x discs at 4x, using a known-good burner.
My personal preference is for 2.4x media, but it's mostly due to price, easy availability, the ability to burn 4x in my Pioneer drives, and that I have about 200 of them on the shelf. I have nothing against the 8x discs, however.
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