Fujifilm XP90 has a 16.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Sony H50 has a 9.0MP 1/2.3" (6.17 x 4.55 mm ) sized CCD sensor . Fujifilm XP90's sensor provides 7MP more than Sony H50's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the XP90 and H50 sensor size comparison.
Fujifilm XP90 and Sony H50 sensors have exactly the same size so none of them has any advantage over other in this area.