Chalkboards are white on black. You basically have chalkboards or whiteboards to draw from. Not sure either is landing in the Louvre. Both have their aesthetic uses. I'd imagine chalkboards for academic topics, whiteboards for business, but different ages and cultures will feel differently.

I bought the color package, enjoying it. It's a personal preference. Hopefully the founders get a variety of feedback and can make a judgement based on multiple datapoints.