My question is why are you thinking about spending more on another stage 1 canned tune without knowing what the change(if any) would be? Being that Cobb and Mountune are both the tune for the general public, Mountune even offered for sale by Ford Performance dealers, what do you expect to gain by spending another $200~?
Any OTS(Off The Shelf, not a customized tune for your vehicle) stage 1 tune will give you the majority of the benefit available.
If you want more, a more aggressive tune will need to be sought, and Mountune, Cobb, and the Ford Performance Parts Pro-Cal are not the answer. Parts such as a good air filter and upgraded intercooler are the usual suggestions before stepping up for more.