I’ve never had a Mini, but from the ones I’ve tried, it’s too small for my liking. I’ve always used 9.7-inch iPads until recently, and I wouldn’t be able to adjust to a Mini. I’ve yet to try a 12.9-inch, though. A friend has one, I will try it next time I see them. I think my 11-inch Air 5 is perfect, but I admit I’d love to try a 12.9-inch. It might be even more perfect.