Share 'Using homemade fondant vs store bought fondant?'

I wanted to ask. I made some marshmallow fondant and the last two times I made it, it crumbled when I went to roll it out. I had it covered in saran wrap and then in ziplock bag and then in a storage container I had made the same recipe before and it did great! I have bought wiltons fondant but the flavor is not to tasty. Just curious of any good recipes or tips. Thanks!