Well the problem is, there are a lot and I mean a lot of moments, but if anything, to me the most meaningful are those that have sakura being the one giving back to naruto, essentially its just showing her development. I mean for all purposes we know naruto loves sakura, the deal on his end though for us to see was throughout the story why he loves her like in the promise of a lifetime and 457.
But for the most meaningful, I would say it would be obviously the hug in 450, that was a moment where she had never been open with him like that. Another one was 631 in when Naruto thanks her for healing him and says you should rest now, Sakura advocates to him how she can fight and that she was trained by a sannin like him. Its then just how naruto knows the look in her eyes and smiles knowing he can trust her. It is short but the recent 663 with Sakura remembering Naruto's dream and now her vowing to save him and not let him die, thats another. Literally this recent scene is a completely different situation than one could have ever imagined years ago, sakura vowing to save naruto no matter the cost, its hard to believe she actually used to hate naruto.
But these are only a few, I mean there are many many many NS moments in the manga alone like Sakura learning what happens to a jinchurki after extraction or Naruto learning he struck Sakura in the 4 tailed state, even Naruto saving Sakura from Sasuke.
One thing NS has over the other pairings aside from development, a reason we love it, its that no matter what happened, Naruto and Sakura have only gotten better with each other, never negative, maybe a little shaken at first around the land of iron but still they are inseparable even as friends. They have gone through highs and lows together, been hurt and been the victim of each other indirectly and still they move forward.Sakura never thought any differently about naruto after learning his fate as the nine tails or even when he struck her in his 4 tailed state. Naruto would never hold it against her for the land of iron events either. Hell this just makes hoping for a revival scene even more meaningful.