Originally Posted by After Shock Media

Never buy precooked, they are treated with liquid ickyness.

A little harder to find but when you buy shrimp see if you can buy it in ice blocks and not individually frozen. Also best with heads on still or at a minimum tail shell on.

Forget brands really, just look at point of origin. Otherwise you may end up with shrimp from China, Chili, etc. Just like a lot of tilapia and other fish comes from Costa Rica and the list goes on. Every bag, box, or whatever of shrimp, fish, mollusks always have a point of origin on them somewhere. If you do not see one, skip it.