I haven't played Exodus yet, so I can't chime in on that.
Of the others though, RE7 and it's not even close. LL is good, but short (it took me around 7 hours). I did like it more than UC4 and 3, though neither of those were half the game UC2 was IMO. Still, it was nothing special. Just more of the same Uncharted.
RE7 is fantastic, and a solid length (first playthrough took me around 13-14 hours). If you can get the DLC with it, do so. They add a ton of story content and a better ending. With all the story DLCs, you're looking at 20+ hours easy, and its great all the way through.
Redux is great too. I personally enjoyed it more than Lost Legacy, though not as much as RE7. It's also two games, so you'll definitely get enough bang for your buck.