I typically chose the winner based on a few different criteria (depending on the challenge) including how accurately they answer the question posed/ complete the task given, how honestly I believe they answered the question/completed the task, how useful/relevant the information is to homesteading and prepping, etc. Mainly the more genuine of a response given, the better. Sometimes I have a hard time choosing so I will number submissions (in the order they were written) and use a random number generator to select a winner!