For the exact iPad we (Jillian & Jordan) use.
The newest iPad Pro is so high-tech that you could even use it as a laptop replacement! Get the 11-inch iPad Pro or 12.9-inch iPad Pro and 2nd Gen Apple Pencil on Amazon. It comes in two screen size options: 11-inch or 12.9-inch. The iPad Pro is extremely fast and powerful, has an amazing liquid retina display, an incredible camera, and you can get up to 1TB of storage. Get the 12.9-inch iPad Pro and 2nd Gen Apple Pencil.
The significant price difference might not be worth the larger screen size, unless you’re a professional artist or designer and plan to use high performance editing apps. We’ve used the 10.5” iPad and have never thought the screen was too small for lettering, especially because you can always zoom in and out while you’re working. But, it also comes with the biggest price tag. The 12.9” iPad Pro is the largest option and the best resolution you can get. However, because the screen is so small, we don’t recommend this if the main purpose is to use for creating artwork.
It’s also $100 cheaper than the iPad Air for the same processing power and storage. It has the smallest screen size (7.9”) and is great for on-the-go use. So if you have a little extra room in your budget, the iPad Air gives you a better value for your money than the regular iPad. It has twice as much storage as the iPad (starts at 64GB for $499 for the current model) and runs much faster. If you plan to use your iPad for many other applications in addition to Procreate, such as taking photos, editing videos, etc., consider the iPad Air. Because it's not as fast as the more expensive models, you might notice a slight lag when writing with the Apple Pencil. If your main reason for getting an iPad is to use for Procreate, 32GB of storage would be enough. It's the cheapest option, starting at $329 with 32GB of storage for the current model, but has a large enough screen (10.2") for creating art.