I have Last of Us for PS3, never opened it. Bought the remastered version for PS4. It is a great game, but it is all about the story, so I don't think you really need to get the remastered version.
Uncharted 4 is great, you should play it. It takes some of the best parts of The Last of Us and combines them with the charm of Uncharted. It starts off really slow, but once it gets going in about Chapter 10, it is absolutely wonderful. Best story by far of any of the Uncharted games. I'll say I liked the gameplay better from Uncharted 3 though.
Uncharted 4 is great, you should play it. It takes some of the best parts of The Last of Us and combines them with the charm of Uncharted. It starts off really slow, but once it gets going in about Chapter 10, it is absolutely wonderful. Best story by far of any of the Uncharted games. I'll say I liked the gameplay better from Uncharted 3 though.