The Pro without a doubt! You will be getting the M1 chip with 8GB of ram. It’s going to fly through every single task you throw at it. Promotion is going to come in handy when scrolling, multitasking, games, etc… When your switching back and fourth in between apps, the experience will be so much better. Promotion will be your best friend if you plan writing notes with the Apple Pencil. The Air 4 is going to feel laggy in comparison. When it comes to software, Apps are nowhere near as limited as they used to be. I can go through an entire day without even touching my Mac. I would say go for the Pro and get the Magic Keyboard and Pencil to go with it. The 11 inch M1 Pro is the best iPad I have ever owned. I’m actually surprised at how much I use it. It was initially just going to be secondary device, but lately I’ve been using my Mac less and less. I will always use both, but currently the iPad is getting the most use of both of them.