Which devices do you recommend?

All Samsung phones and tablets with at least Android 6, for example Samsung X Cover 4 smartphones (720 x 1280 pixels, 16: 9 ratio (~ 294 ppi density)) or Samsung A3 (540×960 pixels, 16: 9 ratio (~ 245 ppi density)

All Apple iPad & iPad mini 2016 and above and in terms of smartphone Apple iPhone 5S and above.

Windows10 is also supported but not recommended.