I have both and have to say I reach for the mini far more often than I do for her heavier 9.7" sister. The mini had iOS 11 installed when I got it and while having the same reservations regarding the A8 that others have voiced here, I knew I had the 9.7" to fall back on. I take an iPad to work, and usage in this capacity is not processor-intensive (email, web, PDFs, reference apps). Primarily I wanted something lighter in the bag I carry. As soon I set up the mini 4, I noticed myself neglecting the 9.7 iPad due to the weight discrepancy. Both devices have the same storage and RAM specs. I'm sure other forum members will offer a differing appraisal, but since 11.3, I don't notice a dramatic difference in performance. After several months of having both, the 9.7 has been reserved for processor-intensive applications, e.g., editing photos, the occasional game, etc. Narrowing it down to one device would be difficult, but the mini gets more usage day-to-day. Even at home where I could easily reach for the more powerful 9.7. The 9.7 is "future proof" for a few iOS versions, but for me was in many ways less convenient. When it was my only tablet, I simply used a tablet less often (as was also the case for older 9.7" models I've had over the years). If you keep an eye out, you can find reasonable sales on a new mini 4. Factoring in the sale price for the mini, and the storage option (128) of the 9.7, I paid less for the mini. I also prefer the mini's display.