Best Moss to Use?

Same willow moss as is sold here...interestingly looks most like a willow tree leaves and branches



MP is so much harder to get a hold of and much more expensive. I was able to find a baseball sized bit of the willow moss for $12. I'm not sure if I will use it, but for the price and amount it was hard to pass up just in case. Branches are soaking and waiting for a moss to be chosen. I plan to apply the fissidens for a dry start with the branches in a container.