Pro is great for VR, and runs much smoother and faster than a standard console, but for most normal games it's such a minor improvement, it's barely worth it. Certainly if you don't have a 4k TV yet. Xbox 1 vs xbox 1 X is night and day, PlayStation ... Not so much.
I genuinely believe its not a hardware issue, but a bottle cap put on by Sony to not make their normal ps look Inferior before the end of its life cycle, and prevent developers targeting their games for the pro level hardware and leaving the other 90 something million older consoles lagging behind.