I find white on black text to be too much eyestrain in any lighting. It's the same thing for star charts - I like black on white, not white on black. Too little contrast: large swathes of black overwhelm the smaller amount of white.
I think most devices that will have white on black are going to be backlit. I wasn't sure from the original post if that was important or not. Some of the lighter devices are eink.
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