There are different factors at play here. For people with dust allergies, whiteboards are clearly better than chalkboards. Also, you won’t have a pile of dust on the floor if you are using a whiteboard. Whiteboards fare well when it comes to readability and contrast as well. It is easier for human eyes to read dark text from light backgrounds than the other way around. However, whiteboards are not great if you want to draw complex designs and art. Chalk will give you better control over the lines and shading. Also, chalkboards are cleaner.