I have 2 "pro" variants but want to get non-pro for my long slides.
Number one, the front of the sight is smooth in 'original', the pro has it so you can rack the slide one-handed, I do see that as an advantage.
Number two, the 'original' has square notch vs rounded in "pro", I find that more appealing for long-range shooting.
EDC wise seems to make no difference.
Internally they seem to be the same.
Here is a review of TFX vs TFX Pro. Scroll to 4min mark you see pics of them in one shot.