I compared the IPP 11” to the Mini and chose the Pro last month. Very happy with my choice, the Mini is incredibly light and compact, but the screen for me just wasn’t as good, plus it seemed to have weaker glass? You could push down and make the LCD screen have those funny rainbow colours, couldn’t do that in the Pro or not as easily, but it’s not something to really worry about as you have to press on the Mini screen to make it happen. Also to me the speakers are better in the Pro, and you can easily tell the difference.
It entirely depends on what you want though. One thing I will say is I play games too and I’ve noticed they are quite big now, even small games are pushing 200mb plus, so that 64GB in the Mini will be a limit. You may want to consider the 256GB model, the base IPP has 128GB which is fine for me.
Both iPads felt fast to me too, both are fantastic devices, I suggest you get hands on with both of them though before deciding if you can, compare them side by side as it’s the best way to make an informed decision. They aren’t cheap devices and are built to last several years with careful use.
I also want to get into some digital art and so a bigger screen also made sense for that for me.