Idk if it's just me but I've always felt like Naruto had BETTER and DEEPER friendships with people other than Sasuke. Like, he really cares and loves Sasuke as a brother but Sasuke barely seems to appreciate or reciprocate that until the end of the series ( and even then, it's kinda eh). For me, Naruto could've been "best friends" with someone else but oh well. Just my opinion.
I think we can all agree Naruto upkeeps his friendships better yeah, lol. Sasuke…tbh is a complicated character, and not one I analyse enough to be confident in my opinion, but…
I mean I think some part of Sauce did care a little, but he wouldn’t let himself act on it since he had bigger priorities aka revenge and going off the deep end of darkness. It’s good Naruto beat him back to his senses, lol. Though I do think series wise Naruto and Sasuke were depicted to have a bond unlike the ones he had with others. So in a way they’re the only ones who could be best friends in soul but not based on how they lived every day lives. Like, they are best friends, but it’s because of the understanding between their souls, not because of how much time they spent together.