@CJ
The 2017 iPad Pro 256GB seems to be better value for money. Performance is going to be pretty similar to the iPad Air 3 you currently have.
I suppose you're going to sell off the iPad Air 3? If it's working for you why sell? While the 12.9 inch has a larger screen, it's less portable so you'll always need to set it on a table or somewhere to draw.
@CJ
The 2017 iPad Pro 256GB seems to be better value for money. Performance is going to be pretty similar to the iPad Air 3 you currently have.
I suppose you're going to sell off the iPad Air 3? If it's working for you why sell? While the 12.9 inch has a larger screen, it's less portable so you'll always need to set it on a table or somewhere to draw.