Who Would Create The Stronger Child?
This is all hypothetical.
-What if Naruto got together with Hinata and had a child?
-This isn't fact, but I believe Jinchuuriki Chakra can mix with the hosts child. Naruto is a perfect example of this. His mother was holding Kurama and Naruto at the same time. When Naruto was born, he inherited whiskers like Kurama and seemingly has unaturally high chakra reserves. If Naruto had a child, I believe the child would inherit some of Kurama's chakra (also remember the Gold and Silver brothers inherited Kurama's chakra just by eating the beasts stomach lining).
-The child would also inherit the fighting style and eyes of the Hyuuga.
What if Sasuke got together with Hinata and had a child?
-It has been shown through the Uchiha Clan that eye techniques can rival the powers of the Jinchuuriki. Would the Hyuuga Clan and Uchiha Clan create some sort of new eye? Remember... the eyes have changed and transformed since the age of the Sage.
If Sasuke and Hinata got together, Sasuke can teach the child the Uchiha Clan techniques and Hinata can teach the child Hyuuga techniques.
Who do you think would have the stronger child?