The more I use iOS 11, the more I believe that if you want a lasting device, you need one with 4 gb of RAM.
It has to be a pro.
On my iPad Air 2, I only have 400Mb of free RAM once the Operating System has loaded.
On an iPad Pro at work, there is over 2 Gb of RAM free.
The iPad 9.7 2017 has no more future than the iPad Air 2. The Air 2 is a nicer machine over all, with the size, weight, and non-reflective screen.