Nook SOC:
https://www.mediatek.com/products/tablets/mt8167a
Fire HD10:
https://www.mediatek.com/products/tablets/mt8173
Nothing wrong with the Nook SOC for reading.
But for video and gaming, FIRE HD10 laps it.
The real question is in the screen and the FIRE is known to have a great screen with excellent color reproduction. The Nook... Reviews will tell.