I used a $50 black Friday special RCA 7" tablet. Plugged it into my Makergear Prusa Mendal running a fairly current marlin on ramps 1.4.
It just worked.
I love it when things just work.
It took me a minute to figure out that there is a tab on the right side to toggle to the printer controls.
I loaded a gcode file I'd sliced and printed on my laptop. It worked just as well as my laptop.