One X or PS4 Pro, I have both.
I have TGC 2 for both the XBox One X and PS4. It clearly looks and plays better on my X, but in fairness, my PS4 is a stock version.
As for TGC 2019, if that's what you're really asking about, the XBox One X version will at least have the option to render at a native 4K res, while the PS4 Pro version will at least have the option to render at a native 1600p. I say "option" to each because I'm hoping there will be a few Quality/Performance options. It's reported that the X's 4K res and the PS4 Pro's 1600p res will run at 30 FPS, and I'd like to have an option to at least get to 40 FPS, or higher.