Hello,
See my answer to the other thread you posted about 7.9 inch tablets.
I use a Samsung Tab S 8.4 Android tablet. I use Wi-Fi. It seems to work very well although I have not used my Spark much since it's winter around me.
I have seen the Tab S on Amazon, Refurbished, for about $130 if you buy from one of the third party vendors.
This is an older tablet, circa 2014, but it has a very high resolution display, fast processor, and a good amount of RAM. The Android version is listed as 4.4 but mine updated itself to Android 6.0.1.
This tablet will not fit within the arms of the RC (see my "flight controller platform").
Barry.