Storage costs aren't always commutable
quote from the article: "Decent 128GB cards can be had for under £80 these days, proving that Apple is really taking the proverbial with its storage costs."
In-device flash storage is normally vastly overprovisioned compared to removable memory cards, so I would not be comfortable saying that a 16GB MicroSD would be identical to the 16GB internal memory on the Tab, or that a 128GB MicroSD is identical to the internal memory on a top of the range iDevice.
Having said that, I'd always prefer to have removable (i.e. replaceable) storage for high churn data like storing music or video, because changing the MicroSD when it finally dies is both easy and cost-effective, and they are also easily transferable between devices. Nice to see Samsung keeping MicroSD support as a differentiator from their competitors (including the Nexus range, not just Apple).
Oh, and the way to tell Apple is taking the mickey with internal storage costs is by spotting that they have the same surcharge to double the memory, regardless of the actual increment; 16 to 32GB costs the same as 64 to 128GB (+£80 for the iPad), so the £160 it costs to go from 16 to 64GB (+48GB) doesn't add up to the £80 it costs to add another 64GB to it.