Shadow Play doesn't come in as many colors as the Moda Marbles, but a lot of their colors are pretty much the same. I have color cards for both lines.
Now that Moda has raised their prices on the Marbles to within 5 cents of the Shadow Play, well, that also enters into my decision as a buyer for our store. Moda still ships for free (and very quickly); that is a point in their favor.