Everybody here has excellent points and I don’t have much to add other than I have an iPad Pro and I’ve never regretted it for a second. It’s super lightweight and thin so I can throw it in my purse and use it wherever. I did a full painting the other day while waiting at the mechanic shop for my car to get fixed.
Like others have mentioned, you can use it as a tablet with Photoshop or whatever, but a better computer will give you better results. It’s a little laggy with my laptop but works like a dream with my desktop at work.
Another thing to think about if price is a concern (and you’re fairly responsible) is you can finance through Apple/Barclaycard and depending on the final cost, you can get up to 18 months with no interest.