The GPU in the Intel set up has more than twice the shaders and dedicated HBM2. It's going to obliterate the Vega 8/Vega 10 iGPs in Raven Ridge. And since the extra TDP can be balanced between the CPU and GPU it should perform well in any situation.
This part isn't competing with APUs. It's competing with existing Intel H-series mobile chips paired with a GTX 1050 Ti or GTX 1060, putting that kind of performance into a smaller chassis. It kind of makes sense for them to do a desktop NUC version - it's never going to be a socketed processor that you can drop in to a motherboard yourself, but the integration will fit nicely into a tiny micro-PC where you'll also not have battery life or device weight to worry about so much. You can provide more power and beefier cooling systems to get mid-range gaming desktop performance in a NUC-sized package....
EDIT:
I've not seen much info on the XBox One X GPU CAT; got any links handy?