>>56480264>>56480323There's an interesting opposite to both of these takes. You could say that Reshiram, as a symbol is truth, is not the truth itself. It could very well just be aligned to N's perception of truth. Personal truth and ideals both answer to fundamental reality, so the player's ideals in alignment with reality are still stronger than N's misguided truth. Your battle proves that N just has a fragment of the larger truth of reality itself, kind of like a little piece of yin within yang in the symbol of the Tao.
On the flip side, you could say that ideals are often rigid, while truth in alignment with reality is subject to its infinite, partially uncertain nature. Zekrom is the sleek design with rigid edges born of someone's mind, while Reshiram is the mysterious, shifting nature of reality, almost like a moving set of feathers in the wind or a flickering flame.
The Tao trio is conceptually the best set of legendaries in the series by a huge margin. Reshiram and Zekrom are a beautiful interplay of past and present, the mind and the soul manifested in different bodies. It was so smart for GameFreak to make their secondary typings different types of plasma. They are separate and the same at once, just like yin and yang. That dynamic is elevated with Kyurem in the dynamic as wuji. Unlike both of them, it is a cold, empty container amplified by a specific choice, yet unable to contain both at once. That's because all three are reality if they exist together as the original dragon, but only reflect an abstract dynamic when they exist as they are now. It's great stuff.
To answer the OP, they are both equally canon. Neither can be more canon than the other. The future and the past exist simultaneously in the present until you focus on one or the other. All in the future will eventually return to the past to prime another future.