Even if you have a PC that is more powerful than the PS4 or X1, it doesn't always guarantee better performance on multiplats. Here are the platforms you should get each game on. I own all the PC versions of these games aside from COD AW (and most of the console ones too)! Also fd = framedrops, avg = average.
TOMB RAIDER: PS4 (PC: 40fps avg with fd, X1: 30fps, PS4: 60fps)
DEAD RISING 3: X1 (PC: 25fps avg with fd on 720p, X1: 30fps & 720p)
WOLFENSTEIN: PS4 (PC: 45fps with fd, X1: 60fps with deadzones, PS4: 60fps, all 1080p)
AC: BLACK FLAG: PS4 (PC: 25fps with fd, X1: 30fps at 900p, PS4: 30fps at 1080p)
COD GHOSTS: PS4 (PC: bugs, 40fps & extreme fd, X1: 720p, 60fps with small deadzones, PS4: 1080p & 60fps with fd)
(PS4 narrowly beats the X1 version in all these cases, but X1 beats the PC version in every occasion).
COD AW: possibly X1, cannot confirm yet
AC UNITY: possibly X1, cannot confirm yet
TITANFALL: possibly X1, cannot confirm yet