Prawns, does size matter?

There are many types of crustaceans eaten world but I want to concentrate on the prawn style ones, shrimp, crawfish, prawns etc. There's many different types and the same ones can go under different names so I want to know when it comes to prawny things does size matter? Do you prefer tiny little shrimp or huge meaty lobsters or something in the middle like a tiger prawn?
Does size matter, peeled or unpeeled?
Does size matter, peeled or unpeeled?
Prawns, does size matter?
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