While back I looked at those 2 watches as well.
The black dial is incredibly powerful, more so then the argent dial. But, there is always a but, the light dial is, if I am not mistaken, a more limited or boutique only version thus theoretically lower production numbers.
For me at that time, black won.
And looking at them right now again, black still wins. I wouldn’t care about legibility etc. If light circumstances are poor that you cant read the watch, well I simply look at my iphone.