I was in Greece last summer, and bought both blue and ceramic version in Plaisio.
Blue 16x were bad, about 1/3 was bad (and by "bad" I mean totally useless disc with write errors and unsuccessful burn)
Ceramic 16x are all good and scans much better than 16x blue.
Blue 8x are the best of these 3, not a single problem, and they scans great.
By reading the bach codes, I realize that blues are value line, and ceramic are premium line, but, as I said, blue 8x works great, I burned about 100 of them, not a single problem!
So, my recommendation will be to get 8x blue ones, 16x ceramic is not really worth extra 2.5 Eur difference, but they are great discs, too.