The M5paper is far better. The 400 x 300 is an abysmal number of pixels. 800 x 600, IMO is a minimum and that is very basic now.
Also while Ardunio is popular and easy to start with the original platform is nothing like this open book. Ardunio shields are a poor HW concept and the platform was designed for a much more basic microcontroller than even the very basic ARM Cortex M0 series.
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