I recommend buying a refurbished ipad pro from the official Apple website, they come with a new battery and a new screen (at least, at the time I bought one). That is just an amazing deal as the battery life is really the issue when buying second hand.
I bought my ipad pro 2018, 11 inch, 64GB at something like 500 pounds 1 or 2 years ago. My only regret? not spending more money and buying the 12.9 inch with more storage and RAM memory. But at the time, I just wanted to try the ipad pro; I did not know if it will be a good hardware or not.
For context, I tried many devices and avoided the ipad for many years because "I do not like Apple", and then after many disappointing experiences with many devices, I bought that refurbished Ipad pro and yeah, it is just the best hardware for drawing. Period. No parallax, no gap, no latency. You can draw without wondering why the results is bad compared to when you draw on paper. You can draw without having to reinstall all the drivers every month :D. The software is not the best (iOS is a mess of an UI, Procreate is missing a lot of features), but it works.
The benefit of the ipad pro over the ipad is less gap between the pen tip and the pixels when you draw.
To go with my ipad pro, I bought a wood drawing board to use my ipad on my desk while maintaining a good posture: Link here.
As opposed to a more fancy/pricy solution like the ipad Sketchboard Pro, a good old fashion wood drawing board works with traditional sketchbooks and with any other display tablets.
I also bought a paper-like screen protector. It does change everything, this little scratchy noise of pen on paper! To draw precise lines, it is essential to have a nice level of friction; try with and without the paper-like screen protector and see what helps you control your lines best. Also try a few different brands over time, the Paperlike brand is not necessary the one you will like best. The Paperlike brand has too much friction for my taste (feels like my pen is moving in a jar of jam).
My favorite software (all platform considered) is Procreate although I don't really like it. I love how good it is to draw with it, and how reliable it is (2-3 crash in 2 years on intensive use). But it is lacking important features and the company has no incentive to add features that improve the workflow of 2D artist. Their one-time payment strategy means that now they have attracted all the 2D artists of the ipad eco-system, there is no financial needs for them to add new 2D features. So what we get is 3D features to attract new kind of artists, for instance. I am secretly hoping they start to make paid upgrades or subscription so they can go back to make nice features for 2D artists.