Honestly, for me, there isn't a single one. The games I've played mostly, are all multi-plat competitive titles. There's not much difference between uncharted 3 & 4. Not enough to impress me, anyway. And, for that matter, there's not that much difference between Batman: Arkham Knight, and Arkham City. A couple extra gimmicks, and slightly better graphics. Spider-Man on PS4 was just daytime arkham knight for me.
And then, I ended up with Last of Us, Beyond, two souls, Heavy Rain, Street Fighter 4, Ultimate Marvel Vs. Capcom 3, Grand Theft Auto 5, Puyo Puyo Tetris, and a few other games that are on PS3. These weren't new experiences and completely tarnished my enjoyment of PS4 for the entire generation.
So, if PS5 continues that trend, it'll most likely be the same thing. But, the PS5 is going to have some good tech in it, unlike the PS4. Even after the PS5 comes out, I'll still be playing multiplats on PC, because of graphics, framerate, and the benefit of mouse and keyboard. Only vehicular games should even be played with a controller. I'll be upgrading to a 4080 ti graphics card whenever that thing comes out to insure I'll be well ahead of the consoles.