both suck, pc master race


PS4 is just a newer console than PS3, it have better hardware and software, so games can use better engines and be of higher quality.
Just to give you an example, in PS2, the bone count(bones are what you put when you want a moving part in a model, the more bones the more ways to manipulate it, so a lot of bones in the face is helpful for expressions for example)
was quite limited, so you could see it affect the way they animated and build models, in PS3 the bone limit is much higher, so there are more games with complex face animations.

Same applies for PS3 -> PS4, not sure in what aspects but it's just more powerful a console.