If you upload from the GL.iNet interface you require the .tar file format of the firmware (they should make that clear in the UI). I believe the .bin file would have to be flashed via uboot or maybe a sysupgrade. I haven’t done this myself.
The benefit to me is the NAND version has 128MB of storage for software and is much faster than NOR. Because it has both memories, is more fault tolerant as if you flash a bad image (or screw up your config badly enough) you can boot to the other memory and reflash the other chip to easily fix the problem without cables.
