What is difference between oxygen scavenging and oxygen barrier caps and which to you use for what?
"scavanging" would mean that they actively remove oxygen that would be in the bottle. "barrier" would just mean they prevent oxygen from getting in.
oxygen scavanging caps are more beneficial for long term storage of beer. if you are drinking it in a few weeks to a few months, you might not notice a difference. if you plan on aging your beer for several months, you will probably taste a difference depending on how much oxygen you normally end up with in your bottles (changes depending on your process).