I'll just add my .02c. I was thrilled to get an Asus ZenPad Z8S because it works with DJI Fly and has a good sized screen. Then I noticed that I could only get low resolution screen capture video (a must for me) -- maybe others have better luck, and I noticed that in flight video streaming was consistently glitchy. Maybe five or ten times in a 15 minute flight, and only a moment each time. But -- each glitch could be loss of signal, so it's stressful experiencing it and waiting for it, at least for me. And again, ymmv, so there's that.
I decided to get an iPad Mini 5 (they've been comparatively cheap since the version 6 roll out last December. Wow! World of difference). Never regretted a 250USD purchase less. I really recommend shelling out the bucks to get hardware that can handle the load without strain. Not only are you getting a better operations experience, but you're contributing to public safety too, through running tight spec equipment. It's a win win.
Just my .02c.