Intel/Windows is still attractive for many industrial and commercial applications. The big advantages being remote access and maintenance, especially if you select an Intel vPro model (Core i5 or i7). That's one area where Android is still lagging.
Here is another reason for Intel NUCs appeal. Many CMS products still only support Windows.
Before the Intel NUC, folks sometimes used Mac Minis running Windows as their main digital signage player hardware. The Mac Mini's format meant they were easy to hide behind a display screen but Intel's new hardware is half that size and it has very competitive specs.
Intel NUC continues to be a great option for many digital signage applications.
Here is a great article on ZDNet that covers the specs in detail. There is also more information about the new NUC models on Intel's web site.