Digital Foundry und Eurogamer: PS4-Version is better than the xbox1-version. Dark Souls 3 has the "BLOODBORNE"-ENGINE !
Video and more:
http://www.eurogamer.net/articles/digitalfoundry-2016-dark-souls-3-bloodborne-engine-on-xbox-one
PS4:
+ 1080p Full HD
+ better performance / more fps
Xbox1:
- 900p
- under 30 fps again and again