I mean, Himawari would have access to TCM and Truth Seeker Orbs while Boruto has the Karma and can be possessed by Momoshiki but I'll probably say Boruto because because he's going to be made super overpowered since he is the main character.
Optimistc…and very angry at kishimoto for not giving hinata the tenseigan. (I feel like both him not giving hinata the tenseigan, and having her retire from combat duty after having boruto is the dirtiest thing he ever did to hinata fans).