Sources at Square Enix have confirmed that Tomb Raider Definitive Edition will run at 1080p resolution on both next gen consoles , however the PS4 will run at twice the frame rate of the Xbox one which will run at a mere 30 FPS (average).
The Xbox One version can reach ~45fps, for a majority of play it will sit around the ~30fps market, give a few frames. Same goes for the PlayStation 4 build, which in most cases hits around 60fps, take a few frames. Our sources have not confirmed exactly, but our own extrapolation of the information suggests you might say the average (accurate use of the term) Xbox One performance could be ~35fps, meanwhile the average PlayStation 4 performance may be ~55fps. Actual, concrete performance benchmarks will need to wait until the game is out for everyone, as we certainly donâ€™t have them.