Reading further, wiki-ing ,finally concluded the debate to my own-self stating
Cupcakes are mini versions of cakes. Frosted and Adorned. They are unremittingly sweet and are served during special occasions.
Muffins are a smaller portions of bread ( essentially quick bread) . They can be sweet or of the savoury type ,by and large eaten for breakfast or as an accompaniment for tea time.
If you threw a cupcake against the wall, you would hear something of a “poof!” If you threw a muffin, you would hear a “thud!” A commenter writes on the English Forum
Time for my judgement ??? Off course the cupcake.. They are beautified with the lovely icing and that’s the icing on the cake.