The major difference is in taste. Wilton stuff is - well - gross. The MMF is sweet, just like marshmallows. I think the MMF rolls out nicer. Mine tends to not dry out as hard as the Wilton stuff, but I think others have added something to the MMF to help it hold its shape for bows and figures and stuff like that. My friends really like the MMF - hate and peel off the Wilton stuff. I've used both and now only use MMF.
I only use the MMF as well - it tastes much better! You can add a bit of gum tex to it to make it harden up better.
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