Apr 20, 2016, 15:11
Now that I shoot in raw I keep everything I produce. I load them into Lightroom as soon as I get home, then start processing the ones I want to keep. I keep the rubbish ones just in case I need to steal something from one, sometime in the future. Once I run out of space I will delete what I don't want to keep. I don't take a huge number of photographs so it is not really an issue.
Ask yourself, "What's most important for the final image?".