I'd change basically everything.
The fights that were skipped would be shown. We'd see a horrific fight with the swordsmen, including Magnetsu being the last swordsmen standing and using all the swords, the Kages, especially Gaara's a father, a bit more, Kimimaro a lot more, Chiyo, etc... and so on.
Naruto wouldn't have entered the war as early as he did. The first part of the war would focus on Kakashi, Guy, Lee, Neji, etc.. and then the Kages. Also, his clones wouldn't take out anybody as, for example, Gaara/Onoki/Temari would beat the Third Raikage by themselves.
Kimimaro would've recalled Jugo and Jugo may've possibly met him, or atleast considered the idea of that his friend might be revived.
Sasuke would've stayed insane and reckless.
Naruto wouldn't have gotten tons of extra chakra every time he lost some.
More deaths.
Obito would be the same mindset.
I wouldn't have sealed Nagato the way he was. I'd have some other technique take him out. Hell, I'd rather there be no Nagato. I like Pain as Pain.
Sasori wouldn't have been defeated so easily.
More screentime for Kakuzu, Deidara, Dan, as well.
I don't think I would've revived the kages. However, I do love their badass moments.
Basically, I'd make it more of a war.