There has been talk recently within the Apple writer/podcaster community about adopting a multi-iPad setup. At first blush, it's a strange notion—why would anyone need two iPads?—but the logic behind it actually makes sense. The larger, 12.9" iPad Pro is a great productivity and entertainment device because of its screen, whereas the smaller, 9.7" iPad Pro is better suited for "lounging around the house"—i.e., sitting on the couch, catching up on Twitter or your Instapaper queue.
I have only one iPad, the 12.9" one, and love it. Aside from my iPhone 6s Plus, the "Big Pro" is my main computer. And by "main computer," I mean I use it for everything. I use it to write, watch Netflix or YouTube, and browse Twitter and the Web. Most of the time, I'm doing all this on the couch in my living room. When I write, I do it from the virtual keyboard, as I'm doing now to write this piece. When I'm reading Twitter or watching video, I do so by leaning back on the couch with the iPad Pro resting upright on my chest.
While the Big Pro is big and relatively unwieldy, reclining on the couch hasn't been an issue in my usage. As someone with low vision, it's a trade-off I'm willing to make. As I said about the iPhone 6s Plus, the Pro's screen is so good for my vision that it outweighs the disadvantage in portability or usability. In other words, big screens are better, thinness and lightness be damned.
Granted, my use case is unique, so I don't mean to imply that the 9.7" Pro is a worse device or unworthy of use. I mean only to say that, given my circumstances, the Big Pro is great as a productivity machine and as a lounge-on-the-couch device.
Aside from my accessibility needs, my love for the Big Pro is twofold. First, the iPad's multitasking features clearly were built for the 12.9" model. It really shines on the large display. Secondly, I love having 4GB of RAM. It makes launching apps, multitasking, everything, faster. The gains in multitasking and RAM are widely agreed upon, but I bring them up here simply to acknowledge them and give my approval.
Suffice it to say, I won't be joining the Two iPad Club. My one iPad is more than capable of doing what I want it to do, and its unquestionably the best computer I've ever had.