I've never used an iPad Pro but I do have a Cintiq that the company I was working for gave me.
It's in its box in the cupboard.
I don't do much digital painting and work in vectors so this is probably why.
I MUCH preferred the Intuos or Bamboo although they take a bit of getting used to (looking at the screen and drawing on the tablet).
Once you do they're great and they quickly replace the mouse or track pad.
Quite cheap and portable too.
One of the problems I found with the Cintiq is that there are a lot of chunky cables and it need its own power supply.
No biggie if you have a dedicated work space but not easy to set up and not portable.
Also, it made the fairly high end Mac I was using fan blow A LOT.
I found myself returning to paper and pencil quite quickly.
These things are super expensive so I'd try one first if you can to see if it would work for you and you can justify the expense.
I'd have been gutted if I'd have bought one out of my own pocket.