I had to post the previous comment before I could look at the two boards on my mobile devices. On these, the dark and light spaces contrast better on the darkkhaki/whitesmoke board. On the e-ink screen of my Likebook Mars, neither appears loud, and the spaces are shades of gray. On my Fire tablet, colors don't appear as bright as they do on my desktop monitor. So I don't find either to be too loud.
I had to post the previous comment before I could look at the two boards on my mobile devices. On these, the dark and light spaces contrast better on the darkkhaki/whitesmoke board. On the e-ink screen of my Likebook Mars, neither appears loud, and the spaces are shades of gray. On my Fire tablet, colors don't appear as bright as they do on my desktop monitor. So I don't find either to be too loud.