I have used the Wilton one and find it very bland on flavor and actually hard to work with. The Marshmallow Fondant (MMF) is great and I highly recommend it.
I got a basic recipee from my local cake supples store:
1 16 oz mini marshmallow
2 tbls water
add too microwave safe bowl and cook for 2 minutes. Once removed add 1 tsp clear vanilla and 2lbs confection sugar. (I always stiff mine threw to get rid of all lumps). Mix together and you have a perfect fondant. And you can use it right away instead of having it sit over night. Its great and just add more confection sugar as you go to eliminate sticking. Hope it works out for you.