50 years ago, they were installing a new scoreboard in the cricket pavilion of the school I attended. Exactly the same question arose: Black on white, or white on black, for the numerals? So a couple of prefects were given the task over going round every class in the school and holding up examples of each style so that, by a show of hands, we pupils could indicate which was easiest to read. (They also carried out trials on the school field, to see which type of numbers were best when viewed from a distance. They were certainly thorough!).
The result? We ended up with a scoreboard displaying white numbers on a black background.
Later, when I was umpiring cricket matches at many grounds around the country, I often found myself looking at different types of scoreboards and trying to work out whether or not our school had actually made the right decision or not. I came to the conclusion that they had.
Further, a Google Image search for 'cricket scoreboard' finds hundreds of pictures like this one
https://nwscdn.com/media/catalog/product/s/c/scoreboard.jpg
and (within the first few hundred results at least), not a single board using black figures on a white background.
So I think that you can work out where my vote goes here ;-)