I use the 1st gen 12.9 inch iPad Pro for sketching, drawing and painting!
I absolutely love mine!
Don’t like the Apple Pencil, though. Too cheap feeling! No good way to store it! Don’t like the kludgey way it pairs and charges. The cover/cap that protects the Apple Pencil’s lightning connector can get lost too easily.
The Apple Pencil is NOT a very well designed stylus, IMSO.
Your mileage may vary.
I use a third party smart Bluetooth stylus that I feel is much better designed and works just as well as the Apple Pencil on my iPad Pro.
Look at the specs here.
https://www.apple.com/ipad-pro/
Good Luck to You!