Both Fujifilm X-T20 and Nikon D7200 have APS-C sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Another similarity between these two cameras is that both Nikon D7200 and Fujifilm X-T20 sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moire occurring in certain scenes.
Below you can see the X-T20 and D7200 sensor size comparison.
Fujifilm X-T20 and Nikon D7200 have almost the same sensor size so none of them has any significant advantage over other in this area.